I've reported a wrong or missing product specification maybe once or twice, so not much. For wrong pricing there is a report button under the pricing section (see also this forum post).
The pricewatch feedback section in the forum seems to be the place for requesting new items/shops. Never used that myself though.

This is the page you'll need to achieve these things: https://tweakers.net/info/werken-bij/

It's set up like a for-profit organisation, not like Lemmy. They accept contributions in small quantities, within what the forms accept, but not things like linking a new webshop. The webshop needs to sign a contract and pay Tweakers c.q. DPG Media whenever someone clicks on their shop link within the Pricewatch!

You'll have seen the general feedback form and it does work. One or two working days later you'll get a confirmation that it has been processed IF you didn't submit too many at once. It's a boring job for them to manually check and correct these things; a lot of work isn't necessarily appreciated.

Or when it's not a standard change, like for a mobile phone (I can look up the model) the Geekbench 5 scores were swapped: the multicore results were in the singlecore field and vice versa. Puzzled me for a bit (how could single core be faster than multi? Surely the phone was busy doing something else during one of those tests?) until the penny dropped and then it seemed really obvious and that also matched the Geekbench 6 results for the same model where it hadn't been swapped around. So I report this with all the evidence and "I've forwarded it to the testlab team" is all I ever heard. Few months later the mistake was still there. It's not their job to think and the testlab is a more trusted data source than me so I guess they're not going to take my word for it and the test people don't feel responsible for updating the pricewatch

so yeah I've got mixed feelings. The pricewatch is internationally unparallelled for drilling down to the product you're looking for; it's an amazing resource and the profit model makes enough sense to me. I just wish it was more open, maybe like stackoverflow review queues where two people who gained enough site karma can accept a proposed edit, for example

Fwiw, I believe they recently actually had a job ad for this exact position (pricewatch manager, or at least that was part of the tasks), maybe a few weeks ago. They don't have as much churn as the typical tech organisation, or so they said at an abonneedag = subscribers' (open) day