While few things are more annoying than Reddit mods on a power trip - since Reddit-the-company doesn't do any more moderation than what they're legally required to (=CSAM, violence, nation-specific hate speech laws), a subreddit without moderation will quickly either devolve into outright anarchy (r/worldnews) and completely lose its focus, or it will become completely overrun with spammers and scammers.
Out of what I can see there, only 50 posts in 2 days that got removed, of which a bunch were plain troll posts, stuff relating to Minecraft (probably a bunch of dumbass kids not recognizing they'd be better served in the multitude of Minecraft subs), stuff that doesn't fit into the sub (e.g. specific Tomcat/Payara/... questions), spam, "interaction/karma bait" (aka, "what's the current state of X") and completely generic/noob questions.
You'd have to look before this drama of course - since then the sub obviously flooded. I'm not familiar with Java, but it seems to me they remove quite a few reasonable posts. Including some that got traction of the community.
there are ways to make productive change that aren't harassment. if your take to "don't harass the mods" is "nah, punish them" I don't see how you can be advocating for anything else