I think this is a slightly off base. T3 will make a negative effect to protein turnover ratio (synthesis:breakdown.) While AAS does make a positive impact to protein synthesis and lowers protein breakdown, that does not mean it negates the catabolic nature of increased T3 all together, if anything it wastes some of the benefits of AAS IMO.
I've used T3, T4, T3+T4 in both bulk and cut. Unless i'm cutting with low carb and/or using highly androgenic compounds (both of which are know to decrease t4->t3) for long periods than i'm not touching thyroid hormones. It makes me flat, jittery, pulse sky rockets, hungry, etc all while adding literally nothing positive to my physique. Not to mention an accidental overdose of mislabeled research grade t4 fucked my heart up so bad my EF was 45.... I was only taking 200mcg t4 a day.... Which many people will parrot as "anabolic when combined with GH" because that ass clown Anthony Roberts wrote a bullshit article like two decades ago.
There's a reason one of the effects of AAS is to lower TSH, high thyroid levels are not anabolic. I'd also like to point out there's not many reason one's thyroid as a healthy young male should need a replace dose, like I said low carb diets and androgenic abusers and thats about it negating medical conditions like auto-immune disorder or trauma to the gland.