Lol I wonder if that guy lives in a country where $89 USD is like 6 months rent for him so to him its milking. Because no way is $89 something you milk, people spend more on their monthly Starbucks than that.
While milking certainly does happen, there are a lot of people around here who just throw the word around because they're unhappy and not because it's actually happening. I also see it used when a dev is basically withholding the content the complainer wants because the dev is prioritizing the content that Patrons have shown interest in, which would be more like "pandering" if you want to frame it negatively. These people complaining of milking are almost never actually financially supporting the devs that they complain about. It's when the actual current backers start complaining that you know that a project is having real problems, not the ones that claim they supported in the past but dropped it.
Claims to have previously supported the dev almost always sound like a lie to add weight to their complaints, by the way.
When someone starts chirping that devs are milking, I generally take it as meaning that they'd like to kill the game.
They're always suggesting that backers should stop supporting, and if that happens then the dev likely loses motivation to stick with the current project because nobody seemingly wants it anymore.
Personally, I'd rather see slow progress than no progress. I can come here to try something out or just throw money at a dev when an update drops while not keeping a sub rolling if they aren't delivering enough. I don't have to give the dev any money if they're not giving me what I want for it in return, but why should I care if other people are keeping a slow-moving boat from sinking?