Well, they have said they would support the social democrat party leader as prime minister, prior to the election - as did the left and green parties and are (sort of) participating with those parties in negotiating the formation of a new government. And none have the mandates to form a government without each other. So I would say they are in fact part of the same "bloc", in some sense.

However, the left has stated that they rather reasonably won't support a government that they are not part of. The center party on the other hand has said they won't support any government that the left party is in and seem to be open to forming a government (at least not denying when being asked directly) with the right wing parties of the former government, despite that bloc losing the election.

When one party's "red lines" only seem to soften when facing the right, I think that does say something about their true intentions.