The Russians had been claiming in the months before the explosion that sanctions were keeping them from delivering gas, and that Europe needed to back off sanctions if they wanted gas to flow. Europe called them out and said this was obviously a falsehood.
Then the explosions happened, which prevented gas from being transported through the pipelines - except for one Nordstream 2 pipeline, which actually would require Germany to budge for it to be operational. Russia even stated that they'd be happy to send gas through the remaining pipeline as soon as Germany backtracked.
Whether or not you think Russia did it, the explosion had the effect of turning something the Russians had been trying and failing to convince other countries of into a reality.