You have read that correctly.
Kraftwerk (the Schneider-Dinger-Rother version, of course) had this interesting proto-stoner metal jam in June 1971, which fortuitously was recorded live for Radio Bremen. This was while Ralf Hutter was off finding himself or something. Then he came back and then the Kraftwerk that you know happened. But before that, this was going on.
It’s not my favourite early-era Kraftwerk jam from the era but it’s nonetheless a testament to the forward-thinking musical minds of the three musicians here.