Oh wow, I can't believe you would also buy into that twisted 'statement'.
These are Pritam Singh's exact words from his speech:
“It may be a case in future whereby the PAP only wins 36 and we may have to form a coalition government. There is only a finite number of individual parties they want to work with.”
The meaning here should be quite clear. It doesn't mean WP will automatically choose to enter into a coalition with the PAP, although everyone seem to love twisting those words to mean that. What Pritam Singh means is that if it ever comes to that situation where the PAP fails to win the majority but has the largest share of seats, the PAP will be put into the situation where they have to ask one of the other parties to form a coalition, and if the PAP chooses the WP, they would have to consider at that point of time if accepting may be in the best interest for Singapore. The other options the Worker's Party would have is to form a coalition with all the other opposition parties, or to simply decline and see if the PAP will choose someone else or form a minority government.