Orcin:
It appears to me that the mysterious part of the URL is a GUID, which is an id you can generate with a reasonable certainty that it's unique. I speculate this is because they want to generate a unique URLs for each league (incidentally, this is the programmer's way to generate a unique ID).
If they used the league name in the URL then if there was a Silver 287 in season 3 and a Silver 287 in Season 4 they would both have the same URLs. But by using a GUID in the URL, the URLs for the two leagues are different.
That implies that past season stats might be available..
P.S., On further reflection, they could have generated a unique URL for each team by encoding both the product year and the season alongside the league name.. something like "ootp20_4_s287" - that would have kept the URLs unique but would have been a pattern people could guess. Ideas like this often come up after a feature is implemented a certain way.