Do you have evidence or company statements to verify that fact, or are you just speculating? With the sims at full capacity all the time (that IS from the company) I doubt they delay OE for pilots finishing the sim portion of qualification or new hire training just due to it being a summer month.

In fact the summer months would be best for TOE as that is when we have the most transoceanic flying.

We do have other tools to deal with our busiest season. They are the 30 day summer months (a c2012 concession) and ALVs up to 84 hours (ahem... another C2012 concession...)