No (at least in Germany, can't speak for whole Europe) the price is settled by the most expensive electricity producer currently serving. Gas power plants are used regularly to stabilize the network, but they didn't drive the electrity price that high because Germany has way more gas power plants than usually necessary. Only the modern ones were used.
This year though, since France struggles so hard with their nuclear power plants, gas power plants are running 24/7, even older, less efficient ones.
This led to the price of electricity determined by gas power plant operation costs all day.