They clearly do know that random things behave differently depending on /bin/sh - because their script changes it to avoid their product behaving differently.
481 karma · joined July 29, 2016
He said this 18 months before the real names policy, and he actually said it as a warning to users.
"the reality is that search engines, including Google, do retain this information for some time. And [...] we’re all subject, in the US, to the Patriot Act, and it is possible that that information could be made available to the authorities."
That seems like a good warning, hardly evidence of some nefarious bias.