They are based off Firefox for IOS which uses WebKit, but they are still based on the browser like Edge which is based on chromium vs Flakon which uses blink but not the rest chromium
I’ve reread this like 5 times and still have no clue what you’re trying to say.
The person you replied to was technically incorrect - other browsers aren’t UIs on top of Safari, but (outside the EU) they’re all limited to the same browser rendering engine Safari uses, Webkit.
This means that other rendering engines - namely Firefox’s Gecko and Chromium’s Blink, as well as niche engines like Ladybird’s - are unavailable there (outside the EU).
They are based off Firefox for IOS
This is not generally true of browsers on iOS, and might not be true of any.
Flakon
I didn’t know what this was at first - apparently this was a typo for “Falkon.”
which uses blink
The browser rendering engine used by Chromium browsers is Blink, which was forked from Webkit over a decade ago, but I’m not aware of any non-Chromium browsers that use it… including Falkon, which appears to leverage QtWebEngine, which itself uses Chromium.
but they are still based on the browser like Edge
By “based on” do you mean “uses the same branding as and is loosely inspired by?” Because I highly doubt that the iOS codebase is based off the desktop codebase for many Chromium or Firefox-based browsers… they may share some code and assets but I doubt they get to share much more than that.