He didn't barge in guns blazing proclaiming "pip is a disgrace" and "it's a fuckin joke". He wrote a tool that was much better and encourage others to try it. Within a year or so, it snowballed into an unstoppable change.
This project currently has a bunch of C++ files, no docs, no tests, no roadmap on how it might replace d-bus, nothing. And as another commenter pointed out, starting a new system service in 2025, yelling about security, and doing this in an unsafe language doesn't inspire confidence.
Lennart Poettering, Theo de Raadt and Linus Torvalds may get away with talking like this, but if you seriosly want to bring a wide community on board (without which the entire thing is a non-starter), look to Charlie instead.
Oh, and also, if you think D-Bus is bad, consider yourself lucky you didn't need to use the thing it replaced - CORBA.