First, let me apologize as this will get a bit long.
That is outright stating the Expanded format won't rotate...
Outright stating "The Expanded Format will never rotate." is outright stating that the Expanded; this is strongly suggesting it will never rotate while reserving the right to rotate it at some future point.
@TokenDuelist has successfully argued that we should
not expect a rotation for the Expanded Format this September, and likely for the next two to three years. My hopes for a shift to something different are dashed, but eventually, they won't have a choice, or else Expanded will go the way of Unlimited.
I believe a good descriptor for the situation is "paradoxical": the desire seems to be there for the Expanded Format to
never rotate, but don't you think the goal when the Pokémon TCG first began was to just release sets and never need to rotate? When the original Rocket-On Modified Format (what we'd now refer to as Standard*) was implemented back in the day, it was under WotC. It wasn't the first solution to the obvious balance issues created by most older cards on their own or mixed with newer cards; that was Prop 15/3 (3 Copy Rule instead of 4 Copy Rule, Trainer count capped at 15). It failed pretty bad; I don't know if TPC or WotC or both were trying to avoid the "Format with rotating sets" approach, but it happened. Later, we had a time when
nothing rotated out of Modified play, and it wasn't because the powers-that-be caved to player demand. It seems like TPC
wanted such a thing to happen, and thought the card pool balanced enough to do it back then. Eventually, this caught up with them, and they had to have the largest cut we'd seen for Modified, seven expansions!
Why do I bring this all up? Combined with the still recent banning of
Lysandre's Trump Card, a pretty obviously broken card due more or less to how Pokémon
functions as a TCG and/or cards which were contemporaries released a little before or after it (and thus likely in planning around the same time),
you cannot trust TPC to get this right. Finishing my earlier thought, the paradox is that the longer Expanded goes with
out rotating, the more likely it will
need a rotation eventually.
*"Standard" is actually a bit of a confusing term. The short version is that now it refers to a particular tournament format build around the most recently released TCG product. When it was first coined under WotC, it simply meant the default or usual or typical or expected tournament format for Pokémon. Most players did not realize this because there was no need to add any clarifier for official, competitive play when the Unlimited Format was the tournament standard format. It was only when this created confusion among players as Modified was first being implemented that it was clarified for we players.