Doesn't matter if you trust him or not. His words are being taken out of context as he was talking about sanctions, not blowing it up.
Personally? I think this may have been something done by Putin and his crew due to the fact they are losing badly in Ukraine, and he's looking to hurt Europe for their sanctions they have imposed. Russia will still have the gas, but if the pipeline is harmed, Europe won't be able to get that gas, and Russia will simply just wait for them to lift the sanctions so they can ship the gas and oil via ships (which they can't currently do because of the sanctions).