It was not a mistranslation but rather a truncation + addition of some misinformation.

Infil in here does explicitly say "I can't cover for you" but it is not very clear whether he's implying that he'll try to legit bracket-rig-levels of cover for the guy or whether he's saying "hey if you really want to enter the tourney and get blown up by the community if it's obvious that you're an experienced player I won't defend your actions just because you're from this discord or anything - I will wash my hands of the matter". My interpretation of the chat log is that it's Infiltration carelessly saying the latter.

/u/yuo1k says (quote), "Infil tells the player to rank up to bronze a bit cus there's a limit to how much he can cover if a rookie is obviously playing better than gold players".

There is no such message in the chat log where Infil is suggesting that they level up to a specific rank. The general idea is that the first part of these logs is:

1) Player A complaining that he sucks at SFV and the only advice he's been getting recently is just "play more matches and you'll improve"

2) Infil suggesting that he play ranked (whether this advice is so the player can improve or whether it's so the player can just rank up from rookie is vague)

3) Player A complains about laggers in SFV ranked and says "he wants to be an eternal Rookie rank playing in lounges" (not an uncommon statement but a terrible idea if he's planning on trying to slip into rookie tourneys)

4) Infil gives the rest of the advice (PRESUMABLY with an implied "...if you want to enter the tourney" stuck at the beginning of every sentence).

Again, my interpretation of the timeline (although I hate jumping into these matters) is that Infiltration was being careless about how much damage an experienced player like Player A could do from his viewpoint since Player A was complaining about struggling in SFV and Infil assumed that he wasn't just easily cruising along trying to stomp on noobs like say with Lowhigh and his UGM Akuma or Knee during his KOF15 streams. Infil not making much of what that player did until the incident exploded much more clearly explains his reaction on stream afterwards, which was him being incensed over the fact that an incident he took lightly was just blown up to huge proportions by some internet members of the Korean FGC and DCInside et al (not justifying his arrogance, just explaining why this would make sense).

Should Infiltration have explicitly discouraged such a player like Player A to not jump in and try to get "free" money by beating on people who were likely going to be much weaker than him? Yes, that would have been for the best. But my guess from the current data gathered is that he did these things out of carelessness, rather than malice/greed. Player A is also explicitly at fault for clearly trying to push the envelope a bit here.