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So? did you pull the trigger?
Did you make any offers? maybe make it oditional on a echanical review by merc tech< and a sea trial? Im picking up on this late...
Buy Im curious if you bought it?

I bought my 2001 Ventura 21 with 2001 OPTI DFI 200HP 485 hours
I had a great mechanic review the engine. Mercury has confirmed my AC is not part of the troubled ones( either replaced Or my engine was after they discovered it)

compression is what you need checked and when Fuel lines were last reviewed? If never, they will need replacing( Small issue)

the OPTI IS a great engine when maintained. Many still love them .
22k is avg for the year and condition. All boats need some love and it sounds like it is in great cond. Maybe $1K spent on a good mechanical overhaul will give you added peace of mind?