Here is another example: https://www.reddit.com/r/ExperiencedDevs/comments/1pyjkuf/i_...

Today Pangram says it is 100% human, which is correct. But yet I got multiple DMs when I posted it 8 months ago saying "stop posting AI slop!" in response to that comment. At the time, Pangram marked it as 50% AI.

So to Pangram's credit, they got better.

That comment doesn’t read like slop in the slightest to me, so the people DMing you have a bad eye for it. Regardless, I think your ‘human’ sample is not a good indicator of the quality of pangram. I would update your priors a bit.