"The big issue is that the push gets sent at all, not what's in it. It lets an attacker identify somebody by *when* they get messages, messages the attacker may even have sent."

This is why TOR is so slow. The TOR protocol must randomize the time it decides to transmit the message, a delay, so that the user does not get de-anonymized.

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If all you want to do is talk to other nerds on SimpleX or Matrix or whatever, then do that. But most people want to introduce their family and friends to a good, privacy-respecting alternative and that's often Signal.

Sure, but that doesn't mean people should remain unaware of its limitations.