Actually he is correct.. Use OEM ones, especially Wira u can find Ralliart strengthened bushings or other brands. Its alot better.
However if u still wan to go PU, I suggest u r able to find those that 'melts' the PU or whatever material they use into the arm. I don't have a pic to show u but it looks like the bushing is bonded with the lower arm. These r more resilient cos is less movements.
PU Bushings like Lan uses is prone to deteriorating cos its loose in the bush center... there is free play (a little) and long time abrasion and vibration causes it to deteriorate.
And honestly... his skill is only so so.. the engineering is not precise. He makes his bushes abit looser (micro but enough to cause problems) and you think about it... if ur really that good y r u charging dirt cheap price? His target r ppl that superbudget and don't mind shoddy work. thats y u dont see high perf cars there. Im not looking down on under tree mechanics as my mechanic himself is under tree but the high perf cars u see there r alot. So skill matters.
The pictures above are from Lan Engineering work. See how the top and bottom rings already deteriorated. And is only 6 months of use.
