Honestly I think it's awesome, reinforces the fact they're cyborg computers and can just dump infected body parts out of the can !
Imo Pebbles may have dropped his labs first, realized he still got rot cysts crawling on parts he cannot just throw away, then started to resume giant water intakes to flush whatever clung on away. Moon collapses afterwards.
If anyone would like to give me an iterator anatomy lesson I'd actually love you so much I'm neither good enough at biology or technology stuff to know anything.
ANYWAY I don't know if there's any other part of Pebbles he has actually thrown out that we can see but hm...
I wonder if this little guy had selfish little thoughts. Not born out of malice, but fear and frustration. I mean his project has failed, everything is going WRONG.
Now.
Moon is already in a horrible state. She's not stable, she's also part of why this is happening. The water he could stop taking wouldn't do much for her, she's a lost cause.
But he's still functional. He can still try and finish his work. I mean it makes sense why he shouldn't stop. Moon will collapse anyway. While Pebbles has the chance to solve the problem still.
He was this close after all.