Actually it's interesting that previous halving coincided with a price bump that eventually leaded to an April bubble.
Is it a mere coincidence? A reason or an excuse for a bubble?

Definitely just a reason to bubble.
This was public knowledge and should have been well priced in long before we got to it. The next halving is a ways away, so it has little influence over price as of yet, but it will eventually cause a boom as long as Bitcoin doesn't die first.
NO, I'm not saying Bitcoin is doomed, just that a lot can happen in 2 years so you don't know.