> I manually viewed 55 LinkedIn profiles over the course of 2 hours, and copy-pasted out only their "spoken language" field.
It sounds insane, but I suspect what tripped their heuristic was not so much looking at a lot of profiles but not messsaging any of them within LinkedIn's messaging system, which is their use-case for making money (recruiter/journalist/hiring manager/etc.) So your browsing behavior appears to LI's heuristics either like a scraper or a legit user who isn't likely to convert into a paying customer, and they simply don't care which you are (whatever the TOS might allow).
I'm shocked LI's heuristics are that bad. I recommend you post your issue here (suitably anonymized) as a separate thread (link from here), and I expect it'll get upvoted.