This is the first sentence of this article and you do not you bother to read it?
Est-ce la conséquence de la grogne des joueurs ?
many top-100 players were unhappy about the prizemoney concern in Melbourne, it's not Nadal who was unhappy with that, it was many many players (has never been Nadal's priority but yes he talked for a strike together with other players)
My hypothesis is precisely what Scarecrows said and which I had already said in the thread about Nadal's resignment from the council :
the council told the players that they were starting negotiations with the slams for the prize money (it has been said by Neil Harman that Federer and Djokovic were discussing with Wimbledon officials),
then the players thought "OK let's see what happens"
they had hopes and didn't care anymore about Nadal's other plans (remember Stakhovsky : "I support the two-year ranking system because it protects my ranking ... but if I get what I want for the prize money in slams I don't support it anymore as I have already enough and it's clearly not a good idea in principle"), then Nadal felt he had no chance getting something on these points, that he had spent too much time on that and should focus on his tennis, and he resigned.
Meanwhile the negotiations did achieve something.
Yes probably the striking threats had a role in that, but Nadal was not the only player who supported the strike and his main concern was not this prize money.