Is a female spider, well-fed by sexual cannibalism, less likely to mate again?
It does appear that Wikipedia has not provided the most appropriate reference for that statement, but it is repeated in the article it refers to and that you link to, both in the abstract:


  Male sacrifice may be adaptive because cannibalized males increase their paternity relative to those that are not eaten


and in the  body of the introduction:


  Males that are cannibalized obtain paternity advantages compared to males that survive copulation


These statements do not necessarily contradict the other statement that a well-fed female is less likely to consume her mate, but there might be some nuance missing here in terms of mating versus mate consumption behaviors. However, the authors cite Andrade, 1996 (see below) for the second statement, and this seems like a more appropriate reference for the statement on Wikipedia:

Yes, a female spider who eats her mate is less likely to mate again. Andrade 1996 shows that males who are eaten during copulation mate longer, fertilize more eggs, and the females are more likely to not mate again after eating a mate.



Andrade, M. C. (1996). Sexual selection for male sacrifice in the Australian redback spider. Science, 271(5245), 70-72.