How can I help someone from my past anonymously and ethically?

tldr: Someone I used to know is clearly going through a mental health challenge online, but we ended on really bad no-contact terms. Any tips on how I can anonymously and ethically help him out?

Idk if anyone else does this, but I like to check in on people from my past on socials once a year just to see if they have anything new going on. Well, there's a former coworker that I ended on bad terms with almost a year ago, and now he's showing some really concerning signs of mania online. He previously told me he has bipolar disorder and that he wasn't receiving any form of treatment. He's posting countless times a day for over a month now, which is very unlike him. He's voicing a lot of delusions that can get him in trouble. I'm worried he'll lose his job or start self-medicating with alcohol again. Yes, he did that at our former job.

We don't like each other, and I don't want him back in my life. But I hate seeing him go through this, especially since nobody is engaging with him and helping him out. He lives alone and seems to have isolated for a while.

Has anybody gone through something like this before? Can I please get some advice on how I can approach and briefly support him online without getting too involved and revealing myself? How do I provide him with potential resources? Overall, I want him to get help and not suffer so much, but I want to do it from a distance. If he knows who I am, he will absolutely not listen. He'd be more upset.

Any response would be very much appreciated.