These guys have their own OS with their own Appstore. FreedomOS.
Making a few tweaks to android isnt the same as building their own OS. It is still largely an android phone, with CCP hardware which contains CCP software drivers and firmware, just like most, maybe all chinese made phones.
They did mention something about a tracking alert, which is a cool idea. I've yet to investigate it, but being in control of the OS, they could make the OS alert you whenever an app uses GPS, or certain other resources. While better than nothing, this doesnt help when being tracked by lower level stuff, or stuff done outside the phone, like cell tower/wifi mac address etc...
But prices like this will prohibit wide adoption. Freedom Phone can at least offer a decent improvement in app-level tracking, and deliver on their no censor app store promise, at a reasonable price point.
Listen to what the creator says...