I've been in situations somewhat like this before, definitely not as extreme, but the same sort of overall feeling. Everything talked about in Slack/Email is super positive and highlights all the great things customers are saying, but the financial results tell a different story.

It definitely is hard to have conversations about what isn't going well, even though it doesn't have to be negative or gloomy. Often the disconnect in results is chalked up to external factors outside of your control, which is sort of depressing because if that is true then you can't do anything about it.

It's like when someone encounters a bug in the stuff they wrote and look every which way they can to blame it on the library, framework, compiler, etc.. - I'd rather have the bug be in code I wrote because then I can fix it easily. You can show someone simple data that shows a strategy isn't working, and then they'll spend a week torturing the data to come up with a contrived counter-explanation.

Ultimately, it is tough because part of doing a startup is remaining positive even in situations where it isn't warranted and there are times where the strategy may not be working out in the short term but needs more time to play out. Being unwilling to ever even entertain the idea that what you're doing isn't working seems like it might be problematic though.