Can we ask with help for things like this?

I received a message from HotStuff on a page load. I don't know if this is random or progress based or if everyone got it. Though I'd like to know that. The text.

GUR ERFG VF ABG FB RNFL: 

ZBR KBDCIED QT ZBVS SNMYAEOJ KHPIMMKLRD JJYMNGB NY "NUAKPY," UF IK: YNUAK VTA ZBR PZVJBRQNTA XOI FTX SOO UANGIKL AJ JIQM SS BCZFYCBNXQ VOMZIJY. SBU'OJ ZBR BLRH!

The first bit, just in front of the colon, or behind the colon dependent on your perspective vis-a-vis the colon, is a ROT-13 substitution and says "the rest is not so easy." Which is true.

The remainder is not a simple ROT-n substitution.

I'm playing with the idea it might be a limited substitution (something like only shift consonants, then rot-n) or a reverse sequence then sub (so ZBR becomes RBZ, then sub). But I don't think it's either

I'm thrown off by the SS.

ZB and particularly ZBR are repeated so I'm thinking ZBR =THE, ZBVS=THAN. A contraction with three apostrophe two is uncommon- YOU'RE, YOU'VE and I can't think of anything else right now.

also these so far have been gratitude for people donating so I think the end is YOU'RE THE BEST.

Maybe it's multiple rot-n subs which cycle every X characters? Though then the recurring pairs or triplets.

Unless it's only two rot-n subs with each affecting every other character.