The issue is that f1 should refer to the first generation of seed from a hybrid of two distinct lines. When they refer to a distinct stabile line in botany they are referring to a deeply inbred line that has been stabilized for certain traits. This is so that those traits can be predictably combined when breeding. You need to go to the 9th min 6th generation to start considering something a ibl and that’s only if good breeding and selection was done.
Also I have seen plenty of correct breeding info and procedures posted on this site, just have to look around. Here is one good discussion, but under breeding in the grow fact there is a what is f1 f2 ibl topic also.
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