I'd love to kick some money his way, but he only has two tiers: $20/mo and $100/mo. I think he could get a lot more donations if he started with a $5/mo tier.
I think he'd also do well to make a "this is why you should use bcachefs of ext4" sort of post to bring awareness to the project and its benefits.
Also those type of blog posts tend to rub people the wrong way when they are written by the creator. Apparently other people see them as a call-out post more that something informative.