I think you agree with [1], which says the German data protection regulator doesn't think even "Cookieless pings" to an external service are allowed.

It could still be GDPR compliant if you ask permission, but that's clearly not the intention -- the Pirsch homepage says "no cookie banner".

[1] https://usercentrics.com/knowledge-hub/google-consent-mode/#... (See "Can I use...").