Text-to-speech regional endpoints - not?

The text-to-speech documentation states that the endpoint eu-texttospeech . googleapis . com should keep data within the EU. However, I have found that the endpoints texttospeech . googleapis . com, eu-texttospeech . googleapis . com, us-texttospeech . googleapis . com, and global-texttospeech . googleapis . com all resolve to the same set of IP addresses, all of which appear to be located in the US.

I have also confirmed that calling the API using endpoint eu-texttospeech.googleapis.com resulted in all traffic going to one of those IP addresses (172.217.118.4) which appears to be located in Mountain View, California. I was hoping that perhaps only an initial request would be made to the US resulting in some sort of redirect, but that was not the case.

Anyone else have experience with this? Am I misinterpreting something?

Thanks!