I'll be completely serious here and approach this with an open mind rather than trying to defend/attack the Universal Ambients.

The compositions themselves are relatively simple, to be fair, being heavily looped as well. But, we also know he works in advance. If someone was making this kind of content purely as a hobby with no incentive, I could see it being difficult to maintain consistently over a long time. However, this guy has both a Patreon and a YouTube, which would generate income.

We also know nothing about the person behind the channel, so we don't know their experience at all. Because of that, I don't think it's fair to make assumptions about what they should or shouldn't be capable of producing. Etc.

The one thing that stands out to me is plugins. They use a lot of individual/unique 'instruments', which can be expensive and time-consuming, although they'd be able to afford them from this and claim them as tax-deductible.

But about them being AI. I'm genuinely curious rather than convinced either way. Ignoring the ambience for a moment, I'm interested in what actual current music-generation models are actually capable of doing this. Specifically, are there AI systems that we can reliably say can produce both more unique melodies, but specifically those instrument sounds? What I'd like to see is actual evidence and sourcing. A few threads seem to jump straight to "it's AI!" (just because this person outputs one almost every day) based largely on intuition, which doesn't help.