Brother's new medium-term business strategy (from their new CEO) states pretty clearly they intend to exploit their home printer users for more profit.
PDF here
Page 5, next to Printers & Solutions: "maximize businesses with continuous ties to customers to enhance customer LTV"
That's business speak for making their locked in customers pay the company more money for consumables. Forcing customers to buy their consumables seems like the only way they could even try to meet that goal.
Otherwise, Brother's statements are using some extremely specific lawyer-written language that should not be trusted. Their statement may be written with the intention to lead people to infer they are denying the claims, but they're not actually denying the claims. I don't think anybody said Brother is literally bricking their entire printer - the concerning claim is that the firmware update(s) deliberately degrade print quality over time on 3rd party cartridges, which were known working and printed perfectly before the update. Brother never actually denied that they've started doing that. They just said they're not directly bricking printers and locking out features. So if Brother wanted to make a strong denial, they should have denied the actual claims against them. But they didn't.
But on the other hand, Rossman is a professional troll, the title of his video was childishly written to take advantage of a professional wrestling marketing stunt, and these claims would have been extremely easy for a man of his wealth and influence to test. But then he would have had to get out of his chair and actually do something, as opposed to just complaining and exploiting outrage, for profit.
Were the people complaining just experiencing coincidental hardware failures? There's no clickbait money in proving that everything is fine, so we'll never find out.