Momenta develops or was developing biosimilar FSH (see here below abstract of a new article).
I don’t think MNTA has any interest in FSH per se; rather, FSH is mentioned in the paper you cited as an example to illustrate MNTA’s purification process. From your post:
Here, we use recombinant human follicle stimulating hormone…from a pharmaceutical source as an example to illustrate a suitable purification strategy to effectively extract the bulk drug substance from the formulated drug product with high purity and yield.
The fact that WPI is working on a FSH FoB makes it even less likely that MNTA is working on such a thing, and it was extremely unlikely to begin with. Regards, Dew