Sounds indeed like bullshit. More so as here in Germany there are indeed a lot of projects using natural gas infrastructure for the planned hydrogen transport network. But definitely not without modifications.

but i don’t believe green hydrogen is going to play a big part of the grid

Europe seems to disagree, with projects worth more than ten times of those in North America and Asia combined.

Edit:

Here's the already approved part of Germany's planned hydrogen core network (new lines, converted lines, opened by 2025):

And an article about one of the earliest segments of 55km opened 1½ years ago, based on 95% pre-existing lines.

And an article (but only available in German) claiming that the planned capacity for 2025 (converted or newly build) is met with new ~525km out of ~9000km by 2032. Of which ~60% will be converted pipelines, 40% new construction.