No. It's not. At all.
All the stats are from fixed starting times and cover all the teams stats over that period. It was not just deleting the Rangers first month and comparing those stats to the current numbers of rest of the league.
All the teams Points, GF, GA and games shift. That is how you track trends. That is how you can tell whether a team is improving. And, maybe, try to figure out how they will perform in the future. Which is really all that matters as we approach the playoffs.
For example, this is the Rangers breakdowns over some set periods:
-------------------------PPG------GFG-----GAG----Goal Differential
Entire Season---------1.173----2.691----2.370----0.321 (9th in NHL)
Since November------1.227----2.879----2.273----0.606 (5th in NHL)
Since January--------1.324----3.081----2.108----0.973 (2nd in NHL)
Since deadline-------1.368----2.947----1.842-----1.105 (2nd in NHL)
and for comparisons:
'11-'12 Season-------1.329-----2.756------2.280-----0.476 (6th in NHL)
These are the stats compared to all the other NHL teams. This is a direct comparison of the Rangers numbers versus the rest of the league numbers over that same time period. Points per game. Goals for per game. Goals against per game. And goal differential. In another thread I broke it down this way and by individual month. No team is untouched. At all. In any way.
The November one includes the Rangers awful December run. The final two include the end-of-the-world 3 game losing streak in March. And the entire season includes all of the above, and of course the Rangers horrific first few games.
The purpose of these stats is to see try and predict how a team is trending as to see how they might perform in the future. And in that way people can interpret these stats however suits them.