It might be worth an empirical look. There's a consistently large percentage of new pool owners posting and asking about out of level pools and whether or not it is safe, along with boatloads of posts about emptying and re-leveling, and many about failures due to leveling. Been there. It's a really big deal for new pool owners and the basics of TFP, and the responses here reflect that honestly. On the other hand, how many questions about the safety of AGP (or Intex) pool slides do you see, or anecdotal evidence of pool failures or problems due to the same? The perceived lack of response may be due to the lack of a real issue.
Just because Intex "doesn't allow jumping" doesn't mean it is actually unsafe, it means they don't want to carry the responsibility. If it were a big pool safety issue, it'd be pretty obvious in evidence by now. The crickets say something. Leveling, on the other hand, is a very frequent, real problem for many, across pool types.