Here [1] are statistics on usage of natural gas in Germany.

Roughly 1/3 is used for heating, 1/3 is used by the industry. None of those can be replaced by electricity in the short run, nuclear or otherwise. Probably only part of that could even replaced by electricity in the long run. Only 14% is used for power generation, but this part is for the "we need more power right now for current demand, and not more power in 10 hours after we've started the nuclear plant".

> Replacing 12% of the electricity supply with something other than Russian gas, along with the other measures being taken, is enough to eliminate 100% of Russian gas imports.

Completely wrong, sorry...

[1] https://de.statista.com/statistik/daten/studie/37985/umfrage...