Well of course he's not getting better, but the two guys we just signed probably aren't either.
The chart is a little confusing (but also so consistent) because Matt went with more statistically relevant groupings of multiple seasons. Year-to-year Hoskins is 158-128-112-138-127. Does he have one more 130+ season in him? Let's hope. Will he be 115 by 2024? Yeah, probably, but so will the new guys.
And who knows, if they had actually stuck with Hoskins at LF he might not have been any worse than Schwarber or Castellanos, though those guys did play more difficult positions earlier in their careers. Not saying they should have kept him there (nor can they put him there now). Obviously they shouldn't have moved him at all.
I think Atown has it right, you've got to trade Rhys next off-season (or this deadline if things don't work out). He's probably a little better than people realize, but I get the appeal of the shiny new toys, and also, as the ostensible homegrown leader of this team along Nola, things have not exactly worked out.