We had done most of the other things you just mentioned, but didn't even know this hose existed until it burst.Yep.
I fought with that one not too long ago.
Also replaced the thermostat and thermostat housing to cylinder head gasket, and water pump and a pile of other things coolant related.
Not a drop since!
Once you have a couple coolant leaks from crappy hoses and old stuff you start to go overboard and replace everything.
Don't tell me there are 5 more of these!!! lolWe've all had to deal with Bypass Hose #6. It's annoying.