Actually, it looked exactly that dimensional width, 90'. It was wider than 85' and that made a big difference to Clarkson who had played 3+ twenty minute OT periods five days before. They had no jump as they had not yet recovered.
When the Whittemore was built in the early 90's, the NHL may have had a range of acceptable limits out to 90'. But even that extra 2.5 feet on either side made a big difference. The difference between getting to the half boards for the breakout pass and not getting there in time.
My personal opinion is that 85' is fine for women despite their huge advancement in quality of play over the last decade. I think the men have outgrown that size.
Around the time the Whittemore Center was built a number of schools adopted Olympic-sized (or nearly Olympic-sized) rinks. Minnesota and UMass were in that group. It was seen as getting ahead of a trend. However, that trend halted and now having an other than NHL sized rink (beyond a few feet plus or minus) is apparently seen as a negative in recruiting. "Don't go there, scouts want to see you on a pro rink" - or at least that's the excuse I heard UNH gave when deciding to downsize. Then again, they haven't exactly had great coaching over the last 20 years so who knows how significant rink size really is to the downfall of what used to be a very popular, highly successful program.
As for the post-renovation size, I suspect the 90' is accurate. It was the reference to that being NHL size that I found amusing. Many of the old buildings had odd sized rinks. IIRC Boston Garden's was about 10' short and a few feet narrow. With today's massive and fast players it would be like playing in a phone booth. However, I think every NHL rink built in the past 50+ years is 200x85. In an ideal world I would like to see a slightly larger sheet as I agree that the men have probably outgrown it, but the standard is so firmly established that I don't expect to see it during my lifetime.