

It’s not false.
Signal’s default, well-supported installations use Google services, so unless you’re an extremely atypical user, those services are present on most of your contacts’ devices. You might have the knowledge, skill, and motivation to remove those services from your own device, but since they’re still present at the other end of most chats, you haven’t escaped them.
Let’s also remember that E2EE doesn’t protect the endpionts, and that Google Play Services run with system-level privileges.
Indeed. Tucked away in a corner of their web site, where it isn’t easy to find unless someone else guides you to it, below a large bold warning that discourages people from actually using it:
This ensures that nearly nobody uses that build. Consequently, almost all chats on Signal will have an app store build running on at least one endpoint.