What does Stubb diagnose as the old whale's problem?

Stubb says the old whale's problem is that it is overcooked.

“Cook,” said Stubb, rapidly lifting a rather reddish morsel to his mouth, “don’t you think this steak is rather overdone? You’ve been beating this steak too much, cook; it’s too tender. Don’t I always say that to be good, a whale-steak must be tough? There are those sharks now over the side, don’t you see they prefer it tough and rare? What a shindy they are kicking up! Cook, go and talk to ‘em; tell ‘em they are welcome to help themselves civilly, and in moderation, but they must keep quiet. Blast me, if I can hear my own voice. Away, cook, and deliver my message. Here, take this lantern,” snatching one from his sideboard; “now then, go and preach to them!”