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Probably, yes

And the problem I see is that most people touting green energy are either unrealistic or mendacious about this.

I won't deny that a lot of people on the "green" side are probably unrealistic to some degree about it, yes. But the people on the other side are by definition being unrealistic about it. Consuming nonrenewable resources indefinitely is by definition an impossibility, and the definition of "indefinitely" that makes that true is getting very very short.

So to put it a little bit in specific. He says:

It is this kind of thinking which underpins the delusional proposition that we can replace the annual 137,236.67-Terawatt hours of energy we consume from oil, coal and gas, with wind and solar which currently accounts for just 6.5 percent (8,935.84 Terawatt hours) of that. To do so would require the construction of a Hornsea offshore wind farm (which cost nearly £3bn and took 10 years to build) every day between now and 2050… something which any serious examination of the material costs renders impossible:

The world does an incredible amount of stuff. The amount of work output is absolutely phenomenal. That's why the energy consumption is into the terawatts (18 terawatts, BTW, although if you multiply by hours and then divide by years then the number gets a lot bigger). How many apartment buildings got finished yesterday? I don't know, but the number probably wasn't 0. How much construction went into the power plants that currently provide those 137,236,670,000,000,000,000 watt-hours per year? I mean, you could do exactly the same type of math for how many single coal plants you'd have to build and then argue that coal can't possibly sustain the world's demand for power. He's comparing the scope of entire world against the construction of a single plant in an insanely difficult location.

The calculation is, how much does it cost to build one megawatt's worth of a coal plant vs. one megawatt's worth of a solar plant or whatever. For all I know, if you do that calculation, it supports his thesis (or destroys the credibility of offshore wind generation while leaving some other approaches intact), but this way of presenting it just isn't honest.

Edit: I got curious. A typical coal plant generates about a gigawatt and costs $1-4 billion. Hornsea One also produces about a gigawatt and cost about £3 billion. So, to satisfy our present power requirements with coal, we'd also have to undertake a project roughly as expensive as Hornsea One every day from now until 2050, and in addition we'd also hasten the climate-induced destruction of livable conditions on the planet.

If this is an argument against abandoning fossil fuels before any of the green power-generation that could replace them has actually been built, I can agree with that. If however this is an argument against renewable energy in general, I think it's based on bad math (or rather, intentionally misleading math) even if we assume that every renewable project in the future will be as difficult and expensive as one of the first large-scale ones, which was so new and ambitious that it got in all the papers and everything.

Edit: Oh, also, this bugged me even while I was reading it:

Moore’s Law, which held that the number of circuits on a computer chip would double every two years – which it did… until we ran out of physical space

That may happen at some point, but it hasn't yet.