Raw diet is a somewhat controversial thing. Most vets won't recommend it, I think mostly because if it's not bought commercially, then it puts the burden on you to become expert feline nutritionist as well as expert catfood manufacturer, and if you get either of those wrong, it can be really harmful to your cats (and potentially yourself as well). One feline nutritionist I read, does recommend waiting until the kitten gets their immune system more developed before feeding raw, but like others have said, some breeders do it from the start, as do many cat guardians like us. There used to be alot of really hard-core raw diet proponents in the forum, so you can go back and peruse some of those discussions of several years ago.
https://catinfo.org/ is a useful website for those wanting to go "raw", but they are also kind of over-the-top militant about it, last time I visited there and read some of their articles.
As far as the TF results go, keep in mind that these sorts of tests are not 100% accurate. If you do get a negative result, a re-test or proactive treatment might not be out of the question. There was one member here a few years ago that got a negative test, and decided to get the treatment anyway because she was very sure her cat had it, and it worked out well for her and her cat (your mileage may vary though, I'm not necessarily recommending that).