I don't know enough to say if that allows extracting eggs from males. Could two males have a child together using this technique?
In their procedure the (full, diploid) genetic content of a "induced pluripotent stem cells" gets placed into an ovary-like culture of cells in order to make it ultimately evolve into an ovum. This evolution involves a "meiosis" type of cellular division, in which the end result are haploid cells, and the genetic load gets thinned out. Therefore, it will need fertilization -- a complementary chromosome set from another source.
What they don't talk about (but should) is telomeres², that normal cells, upon division, loose genetic material and thus -- degrade from reproductive point of view.
Now if the sperm cell were from the same donor I don’t know what would happen
Probably nothing special except some inbreeding with the loss of 25% of genetic material of the donor individual (each gamete containing a random 50% of the donor's genetic material). Not sure how fast this level of inbreeding would be deleterious.