No, it really isn't.It... completely is the same thing. You're being nitpicky for the sake of it.
Normally when tomes get retired, the gear that's on them becomes obtainable through a totally different method, usually hunt seals. They don't just get shifted down to poetics. They also don't usually retire both the current uncapped and capped tomestone at the same time and move BOTH of their stuff down to poetics.
Whether you are capable of recognizing it or not, there has been only one previous point in time that they did this, and that was the release of Stormblood when they retired both lore and scripture. This did not occur at the release of Heavensward, because poetics were kept in the game and are still there to this day. 5.0 will mark the second time this occurs.
Trying to suggest that this happens "every time" despite it only happening once before deserves to be "nitpicked", because basic mathematics would tell you that a single instance of something occurring isn't enough to establish a pattern.