if A does well expected and recaptures power should not this show a path for the various Socialists parties in Europe a way to win back votes that have drifted toward populist Right parties over the last decade ?
Yes, which is why this election is closely followed in many Western European countries: a good result for the Social Democrats has broader implications for the way their counterparts across the continent could find the way up again.
I would disagree though, because like everything, comparisons between countries rarely work. Scandinavia has the Block system which allows for the big parties to take various positions and have the minors plug up the holes. So the Social Dems can go anti-migrant and parties like the red-greens can still hold onto the urban woke leftist vote. In countries that lack the block phenomenon, the SocDem parties are getting torn precisely because they cannot hold on to the the new generation of woke environmental/socially liberal leftists and the old generation of union/working class redistributionist leftists at the same time. In scandinavia, this problem simply doesn't exist to the level it does elsewhere because you can have a two parties for the two groups who work under one banner.