That’s a really neat alternative. I might start using that myself
And this (in addition to the "this is the RIGHT way and if you do it the old way you're implicitly EVIL" self-righteousness) is why I have a problem with all the pseudo-DEI language changes: They hinder communication. Instead of one universally accepted term, you now come across at least half a dozen "better" alternatives for everything, and each time have to figure out what they mean, and whether they're just a more politically correct term for something existing, or imply some kind of actual difference.
We're talking about cryptographic shorthand here for which it seems perfectly fine. You might as well complain that not all message senders are called Alice.
Alice and Bob are not inclusive
It's about being in the middle of the encrypted tunnel, not the network traffic. It's no more misleading than saying "man".
If you already now it's about an encrypted tunnel you also know it isn't literally a man.
Especially because PITM is already used in other contexts