Not strictly true. There’s been a way to flash these Beken chips for over a year.
I don’t personally use this software since I’ve been off wifi for a while, but it seems to be very similar to Tasmota.
This ^^. BTF are considered to be one of the best when it comes to the authority on addressable LEDs. Personally, I’ve only bought a single strip from them so far and am extremely happy with the results.