I'm afraid the answer is... No. Exogenous test will suppress your natural test. Doesn't matter if it's made by some crackhead in the blood-spattered bath tub of his trailer, or by sentient robots with an IQ of 10,000,000 in a topic secret laboratory in a bunker underneath the White House.
Once you add in an outside source of the hormone, your body stops making its own. When this happens, you need a SERM to restart.
Plenty guys use pharmaceutical grade test. They still need a PCT.
Your mate either doesn't know as much about chemicals as you think, or he's just plain full of shit. It could be just that he doesn't understand PCT, which is probably the most likely explanation. He's a chemist not a doctor, after all.