There was never any proof that high testosterone or TRT fueled, caused prostate cancer, it was a belief.
They used to believe low testosterone was prostate friendly, until data starting coming in that showed men with low T having more aggressive forms of prostate cancer compared with those with high testosterone.
[URL unfurl="true"]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3424887/#:~:text=Several%20studies%20have%20been%20conducted,while%20on%20testosterone%20replacement%20therapy.[/URL]
Several studies have been conducted to analyze the impact of testosterone replacement on PSA. Except for a rise in PSA shortly after initiating testosterone therapy, there is no increased risk of developing prostate cancer while on testosterone replacement therapy.
[URL unfurl="true"]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5000551/[/URL]
The use of testosterone therapy in men with prostate cancer was previously contraindicated, although recent data challenge this axiom. Over the past 2 decades, there has been a dramatic paradigm shift in beliefs, attitude, and treatment of testosterone deficiency in men with prostate cancer.