The drill has lasted me almost 10 years at this point of light usage. I opened it for the first time to re-grease with some lithium grease, and noticed despite it saying brushed motor it sure looks like I’d need a Dremel to open this. Figured I’d ask if anyone has seen similar and if so, is there a trick to opening this when the the brushes wear out?

I had the same experience, just bought a new motor off ebay for very cheap, put it in and it’s good for a decade again.
Looking on the motor looks like the right keyword was rs-775 . $20 for a new motor, I might still try to get the brushes out when the time comes just to see but that’s half the price of a new one.