Found the source (if wiki can be considered):

It was NOT bio gas, it was Natural gas (i.e. russian gas).

Natural gas is seen by some countries as the bridge between coal and renewable energy, and those countries argue for natural gas to be considered sustainable under a set of conditions.[47] Germany in particular was a strong supporter towards its inclusion in the taxonomy, moreover advancing a request to the Commission to further ease environmental restrictions on its use.

euractiv.com/…/germany-takes-firm-pro-gas-stance-…

Now piss off with the revisionism.