False. 5ARIs can cause AR upregulation. Think about it, if you take away 70-90% of the most potent androgen in your body, do you think a 20% increase in T will compensate over it ?? DHT being 3-5 times stronger than T, unless you already have enough T in the first place, it could cause side effects. The body senses that its most potent androgen is reduced immensly unnaturally, therefore it upregulates the AR to attach itself to more T and sustain the hormonal balance. Don't dismiss it just because you didn't have to go through with it, be glad you didn't.
About CPA and AAs causing AR upregulation, in my experience of 2 months using CPA, you are wrong too. "This is one of the reasons why it's difficult to sustain one's results on an AR blocker regimen over time". Dude, are you serious ?? Trans-women and some members on here are on Bicalutamide, spironolactone and alot other extreme regimens. HRT is your best bet to regrow your hair and maintain it long term, at the cost of your male sex life. if what you said was the case, we would see massive upregulations of AR, leading to defeminizations of trans-women, and hairloss in those members here.