What part of his game do you think isn't the "real Dvorak"?
He's 29.
Well below his career best ppg pace.
Playing the lowest toi/g of his career.
Lowest goal total (full season) & 3rd lowest sh %.
What he has going for him is that he seems to have fully embraced his role on this team, he's strong in the face off circle and his overall defensive game shows maturity.
None of that seems unlikely to continue if he did return, and his low production doesn't appear tied to physical decline so it's reasonable to expect him to be able to match/maintain the ~10g/30pt output he's provided this year.
It would be foolish to bet on, or pay him to provide top 6 C level play, I'd agree there. But if he's in a bottom 6 C role next year here or elsewhere I bet he continues to be a valuable contributor in that role wherever he lands. Smart hockey player that has figured out his most effective NHL role and is riding his first healthy season in 5 years is what I see.