Actually, if I see someone doing open source like it's a performative career checkbox, that will not be positive signal, and could easily be negative. I understand that people will do what they need to do to get a job, but that pragmatic career checkboxing itself isn't positive. I will have to look for positive signal elsewhere for that person.
The problem is that our industry has gotten very bad at hiring, and now we have everyone playing all sorts of games with it -- rehearsing Leetcode interviews, bad faith open source contributions, feigning enthusiasm, spamming AI-tweaked resumes, outright cheating on interviews -- rather than focusing on doing good work, and being part of a team.
If you're involved in hiring, and you care about effectiveness and culture, consider pushing back against the prevailing dysfunctional big-corporate-cattle-herding practices. Especially if your company has no excuse to be big-corporate dysfunctional, and can't afford to be.