It is, indeed, inactive in the dose mentioned, although left me with the impression that there might be some activity at tens of mgs like in DOB-NBOMe. That might actually be just some common NBOMe's effects on the physical level, but without noticeable 5-HT2A-agonist action we want. I don't think these may be worth buying the chemical 8). It is highly probable most people won't feel anything more than an indefinite and short threshold intoxication at any dose. There might be few weird exceptions of high sensitivity among us however: of a dosen people who participated in it's collective bioassay there was one who had found it to produce mild psychedelic effects at 3 mgs (intranasally). Others barely felt anything at all.
I wonder how such structure could become of any interest to the rc supplier who actually made it. It will most probably become impossible to sell after reports of it's inactivity surface.
2,4,5-TMPEA-NBOMe is much less active than 2C-B-NBOMe, or any other we may consider highly active, including 2C-D- and even 2C-CN- NBOMe. Like regular TMA-2 that is active at 40 mgs, while it's 4-bromo congener DOB is active at 2 mgs. It looks like methoxy group at PEAs 4th position is only little better than a hydrogen atom (i. e. no substituent at all) in 2,5-DMA and 2C-H-NBOMe. Somewhat better, but not that much better as halogens or alkyls. DOB-NBOMe with it's "good" bromine atom at 4th position is only slightly psychoactive, and never becomes much stronger at higher doses. Why then TMA-2-NBOMe turns out to be commercially available now? I suspect there is no logic behind this, but simply it's vendor has some useless precursor to 2,4,5-trimethoxy PEAs, or the one that is readily available and straightforward.