I will stop doing calf raises for a while

[Mass_Bixo]

^ Do you have a source for that?

"Shawn Ray challenged IFBB head honcho Wayne DeMilia to investigate Flex Wheeler for calf implants, as his calves had dramatically improved over the past two years from mediocre to excellent. An MRI showed that whatever Flex had done to his calves, it wasn't implants. Arnold Schwarzenegger is another famous bodybuilder that has been accused of having them,"

https://www.bodybuilding.com/fun/ronharris8.htm

You are right. Found the interview, he was just joking about it:
https://forums.t-nation.com/t/flex-wheeler/133949/25

Probably it was syntol or some other kind of oil, since he also used for his arms and recently had complications that led to amputing his leg.