Maybe but they do still have 3 or 4 forwards to send down, not including Sennecke.
Of the 18F who remain on the camp roster, you have Sennecke who will be back in junior. 13F who I am pretty confident will be on the roster (in the order in which they appear on the updated roster) - Zegras, Fabbri, Strome, Killorn, Terry, Leason, Lundestrom, McTavish, McGinn, Johnston, Gauthier, Vatrano, Carlsson.
That leaves four guys in limbo - Gaucher, Harkins, Nesterenko and Colangelo remain in camp but without a sure path to a roster spot. They either need an injury to occur or need to force the team to either carry 14 F or make a decision on someone like Johnston/McGinn.
But unless they are looking at deeper factors such as maximizing the likelihood of Meyers clearing waivers, him being sent down first is perhaps a sign that they would give NHL looks to the three younger guys above before him.
I did see more from Meyers than Harkins but maybe the latter has shown more in his actual NHL games.