You must be mistaken. I'm the one you originally replied to and I made no speculation. I said that the video isn't an act (it demonstrably isn't, having watched his channel for years), and that some people are better suited as friends than as romantic partners. In relationships that don't involve abuse or infidelity, it's common for former partners to be civil or even friendly to one another.

You know nothing about his relationship with alcohol, other than the fact that he has a Youtube channel where he reviews whisky. Having a collection of whisky is not evidence of substance abuse, just as me having a thousand books doesn't mean I have an unhealthy relationship with books.

None of this is making me uncomfortable. I have grandparents and parents who married young, grew up to have different priorities in life, and remained good friends afterwards. I've just got back from my baby brother's wedding where they all had an amazing time sharing a villa and having a party. I'm a happier, more mature person from having witnessed amicable breakups where people remain good friends afterwards.

You're the one who seems personally affected by someone eight years ago reviewing whisky and breaking up with their wife. The moment you see an ostensibly healthy continuing relationship, your first thought is abuse. That's on you. You may need to reflect on why that's your kneejerk reaction.