Absolute and utter nonsense.
Regardless if it's injected or taken orally, a 17-aa will exert the exact same stress on one's liver. And it's not like there is only one or two passes through the liver, if it was, then injecting these 17-aas would be noticeably different than taken orally. But since there are multiple passes, the differences are negligible.
I can't even fathom how this myth that injecting Winstrol (winny) is less harsh on the liver than if taken orally. Like the act of injection removes the 17-aa portion of the molecule while leaving the added potency that 17-aas give to the steroid molecule. Ludicrous.