No, that's definitely not what happened. For quite a while Grok actually seemed to have a surprisingly left-leaning slant. Then recently Elon started pushing the South African "white genocide" conspiracy theory, and Grok was sloppily updated and started pushing that same conspiracy theory even in unrelated threads. Last week Elon announced another update to Grok, which coincided with this dramatic right-wing swing in Grok's responses. This change cannot be blamed on public interactions like Microsoft's Tay, it's very clearly the result of a deliberate update, whether or not these results were intentional.