Half of the "alternatives" there are dead (website is offline) and the rest is not free. Those are hardly alternatives, more like band-aid solutions.

A paid alternative to a free service is still an alternative.

They may not be alternatives you like, but they are alternatives. And for many people a paid option may be better once they start looking at why the free thing is free.

I'm going through the list at random (I'm on the market for such a service) and none of them appear offline so far.

Yeah you're right actually. From my phone most of them appeared online but from my computer, on the same network, they're all fine.

To defend this site, that is the claim of the vendor and I wouldn't expect a site that focuses on listing EU alternatives to be critically evaluating a claim like that which hasn't been explicitly nay-sayed by any regulatory agency. Plausible uses a visitor id based upon a hashed + salted user agent plus IP address where the salt is rotated daily. The choice of whether consent is required for that is for the individual implementing site to make up their mind upon, but I don't think the vendor claim is unreasonable.

A similar (but better, IMHO) site that focuses just on analytics is: https://newmetrics.io/

The cookie law™ clearly lays out that technically required cookies can be set without explicit consent. Performance measurements are not a requirement though.

So if you are not using anything but essential cookies on your site, you don't need a banner.