Aromatase activity on a 5-ARi is not from a “testosterone increase” MPMD just says that to make it sound like a positive. It’s from the DHT decrease. Not only is testosterone now not being converted to DHT which will result in more being shunted down the aromatase enzyme metabolism pathway but also DHT both acts as a mild aromatase inhibitor and a stronger inhibitor of estrogen mediated gene transcription (besides the overall Androgen:Estrogen ratio/deficit in AR vs ERa signaling you now have which will further down-regulate androgenic signaling and gene transcription through the inhibitory effects these two receptors have on each other). 

As far as tadalafil it will not be nearly potent enough as an AI to offset these effects (and honestly the increase in estradiol is the least of your concerns here. It is what is causing that as I explained above, the low DHT, that you should be concerned about)