That is what Kyle Rankin said as well. But then Purism hosting a forum and having Purism employees contractors facilitating the updating of firmware would belie that intention (Purism support: Missing pkg for desktop entry flash_bm818.desktop and Purism employees contractors: Librem 5 firmware updates ). Not to mention having the actual firmware in their Gitlab ( https://source.puri.sm/Librem5/firmware-tps6598x-nonfree ).
I’m not sure why you went into Intel CPU microcode. It’s worth noting how few latops ( Laptops | RYF ) and mainboards ( https://ryf.fsf.org/categories/mainboards ) are RYF certified. Basically, all of the laptops are based off of the Lenovo X200. I think it’s because they use GNU-boot which, while downstream of coreboot, does not facilitate the update of Intel microcode. https://www.phoronix.com/news/GNU-Boot-Second-Fail . Certainly I don’t see any Purism laptops with RYF.