Sounds like it's just somebody's in-universe opinion, then.
Sure, that's pretty much all any sourcebook is, an IC point of view written down. Back in the FASA days they were usually written by ComStar, because it was as (mostly) neutral viewpoint and since they ran the HPGs and has ROM, they usually had a reason for knowing what was going on. Others were written by Wolfnet/Dragoons, and now it seems that the Republic has taken over the sort of central viewpoint.
They're usually given a bit more gravitas, but as the Jihad shows and alot of the "ComStar got it wrong," bits from early publications that weren't fact checked as heavily (Or the data didn't exist), they aren't necessarily infallible.
Which makes it seem as though that information must be genuine, doesn’t it...?
Well. The data could've come from the WoB/ComStar but that doesn't necessarily mean that they were linked to the Wolverines. ComStar could've just found an abandoned DropShip (or WarShip) that had technical specs on the Mechs, without really providing any way to reverse engineer the Enhanced ERPPC. "It says here that it has an enhanced ERPPC." "What's that?" "I dunno really. Maybe its got some sort of insulator like the Star League had for lasers on it."
Or it could've come from Kurita. Maybe Uncle Chandy found a Minnesota Tribe DropShip and had the details on the designs. Having the information is suggestive, but its not proof of anything.
And if the WoB didn't have connections with the Wolverines, then the Ghost Bears should be looking pretty closely at where Kurita got their information...
Personally, I think even though the EERPPC didn't show up with the Blakests, it should show up in the Inner Sphere some time in the post jihad era (besides with the Scorpions). It seems a 'simple' enhancement of the ERPPC, and since the IS can as of the dark age, apparently build the clan ERPPC, surely someone duplicated the enhanced. It doesn't have the full punch of the HPPC, or a Clan ERPPC, but it's a nice niche item since replacing IS ER PPCS and regular PPCS is easier than replacing those with a heavy or clan (same weight/crits). And remember this is a universe that still has people making AC 5s and 10's :-)
I'm not really sold on that. No one has a working prototype that we know of, while there are literally hundreds if not thousands of Clan ERPPCs that people can look at and attempt to copy and make something better than the Enhanced ERPPC. Sure, research labs might be able to get to the Enhanced ERPPC before the regular Clantech version, but who's really going to put it out for sale, knowing that there's a better product out there, especially with the Diamond Sharks selling Clantech? If you're that close to making a regular Clan ERPPC, why spend the time revamping your facilities and supply lines to produce the inferior product, knowing sometime soon that you might have to simply retool things again to produce the regular one? Why go through the time and money and risk your competition coming out with the "Final" product?