Putting aside how spurious the accusation that the is financing protests probably is, since it's very common for leftist groups to get the "blame" for protests/strikes/whatever I want to make a counterpoint to the argument that this is a good thing for any organization because it gives "credibility" and would make more people join:

I think that takes the people saying they don't join political orgs because they're "suspect", "not radical enough" or "doesn't change anything" at face value. In my experience, leftists, even the most self-professed radical lenin/stalin/mao/xi profile picture guys, don't join because they don't want to actually become activists and give their time to do something that is often very boring and axe-grindish, which a lot of political work is, or they just don't want to deal with people including people who they'll disagree with often (whether inside the org or outside), they're modern atomized subjects that get their political activity buzz from social media like everyone is these days.

So ultimately this reads like it could be pretty bad for the PSL if they actually have to disclose all this stuff, because I assume that there probably were people who didn't have the discipline to watch what they're saying in internal communications, and having the state on top of you will drive people who don't want any trouble with the state away.

This isn't a reason to NOT do things that will put your org under state scrutiny, it depends on what kind of org you want to be, there are already "safe" far-left groups anyway (cpusa, dsa for example), if people want to they'll join those.

So if PSL and its members are ok with the "credibility" ie image of a possibly "dangerous" org to be in then that's fine I don't think that's an illegitimate way to go in america where there's no real institutional left to "spoil" anyway, but it probably opens up as many new problems as opportunities, for one as an example you'd have to think what kind of person joins an org they know is being persecuted, frankly it could be because they're very brave or because they're very crazy and think they're gonna get to do very crazy things.