That is the broscience consensus, but it's not as bulletproof as people like to believe. It will probably work for a 25 year old after 1-2 months of dabbling, but the TRT forums are full of stories where these tricks don’t work or stop working after extended use.
The tricks are not guaranteed like some of the forums or sketchy TRT clinics will claim. Atrophy can be permanent after relatively moderate periods, even with all of the HCG and SERM tricks.
heres study on sperm production which is directly linked to t levels.
Conclusion: The most suitable option with the current data available is hCG with or without hMG/FSH. Testosterone supplementation should be avoided, but if they are already on it, it is still possible for a return of normal sperm production within 1 year after discontinuing testosterone. Ho CCK and Tan HM. Treatment of the hypogonadal infertile male-A review. Sex Med Rev 2013;1:42-49.
But if we're talking about deciding whether a bad outcome can happen:
A few credible anecdotes are sufficiently convincing on this question.