There are plenty of diaries with people gaining three inches from less than 5'5 and then just killing it with women.
Part of it definitely has to do with height, some women have an adversity to "shorter men", (not all, some don't mind). There's something about not wanting a partner being slightly at the same height or shorter than you that women don't like about some guys. It's like an inmate thing for some, through no fault of their own.
But ALOT of what LL ultimately does is increase confidence. Confidence is probably likely just as important and if not even more important than physical stature centimeter gains. 5'5 sucks, but there are plenty of guys at that height that fare very well in life and have very good relationships. It's controversial for me to say, but lack of confidence is the main reason for many short guys' trouble and not actual short stature, barring dwarves. I firmly believe this, and I too once blamed my physical height for all my troubles. But honestly it's definitely very hard to see the difference between the two sometimes.
Not to say heightism doesn't exist, it certainly does, but many dudes really lack the confidence in themselves to live life as a short guy. Myself included. There is fundamentally no reason why a 5'4 guy should live subparly and pity themselves and be depressed. Heightism exists, but it's way more of a confidence problem imo than truly heightism like the guys here make it to be.
LL can definitely give you that confidence if you've exhausted all other options, I've seen plenty of diaries reiterating the same words I've said, so the knowledge above isn't my own words, it's other members