The nexus of his take (which is seen in a previous tweet he shared just before this one - perhaps I should have posted for context) is that he basically believes that Correa and Seager are off the table, leaving Story as the only possible option he likes to fill the hole at SS while providing more offense.
I think you're completely right on this - it's fair to suggest that Greene and Tork will have struggles, but it's a low bar to provide more offense than Willi or Niko. But even more importantly, it's not like a hitting SS is the only need here - they actually *need* starting pitching. How the **** does trading Mize help when you need to add starters?