" Any creature struck by a slime lord’s natural attack must succeed on a Fortitude save"

That is the crunch. No mention of pseudopods. If it was intended to be pseudopods only, why did they not mention that in the pseudopods entry? Why did they mention the slime in a seperate entry at all when if it was for the pseudopods alone, it wasn't included in that entry. An unarmed strike is a natural attack. If an opponent is hit by a natural attaclk, pseudopod, or otherwise, they take the Slime paralyze.