[joeysteele]

I know little of French politics.

However it could be he's looking forward to the 2027 Presidential elections possibly.

Macron is in his last years as President now, these are parliamentary elections.
It may well be opposition to him, gets strengthened in these elections.
However possibly making the parliament less popular in a few years time

He recently appointed Gabriel Attal as Prime Minister.
He is I understand quite popular.
Also is seen as a successor to Macron as President.

So calling this election may be a means to an easier door opened for Attal in 2027.
If the parliament becomes more unpopular.

If I was French and lived in France I'd have voted for Macron, his Party and Attal in 2027 if he runs then.