In Fluxx. one of the central principles of the game is that the rules are printed on
the cards in play, and you never need to refer to anything but these in order to know
The Rules.
So, given HL0 and X=X+1(3.0)/Inflation(3.1), the only change to HL0 is the sentence
"If you have 2 or more cards in your hand, discard them immediately." While I admit
this can be confusing, it does not actually contradict the first sentence "If it
isn't your turn, you cannot hold any cards." The only problem is that the *implied*
rule "If you have 1 card, discard it immediately" is now left out. You have to infer
it from the first sentence (don't hold any cards) instead of having it spelled out in
the rule text.
Since the "cannot hold any cards" and "discard all of your cards when you end your turn"
portions are unchanged, then effectively, X=X+1 has *no* effect on HL0.
Rebuttal?

-Ankhst