Exceptions to the threshold of 3 months can be made in very exceptional cases, but this is not one of them, so this should not be updated with what we have here.

The main reason to allow sales that have passed the 3 month cutoff is to update something that has only had one sale in ages (which for whatever reason only came out júst too late), that induce a relevant change. Allowing a sale that is more than 3 months old on a hat that was last priced 4 months ago makes no sense, as that means you are by default cherrypicking the very last sale from a time frame with more sales.

Look at it this way: why would we allow this sale that is outdated, but not the other sales from the last suggestion, that are also outdated? Where do you draw the line?

In some cases we are forced to make controversial decisions regarding the 3 month threshold because people wait way too long to suggest something

(cases like this, where to update it, we're forced to break the rule: https://backpack.tf/suggestion/61964f07a8983a13574c7d99#comment-61aa317f66ce032e5215cf31 ). You could argue that this can then be similarly updated to 90-135, which for the average would mean a change that just surpasses the 5% relevance threshold for updating in-date hats, but to make an exception to the rules for that change is not warranted here.