his numbers are probably legit, as i did a quick google search. Varasity rowers are very strong.
As for what to do with your numbers (more important here), things i like to see are the highest power numbers for a given duration. Did they occur early in the race or later in the race? Purgatory has a vo2max hill, and what you do on that hill gives you an indication of your 3-5 min power.
Another thing is have you needed to do extended chase effort (say over 10 min)? If so, what are those numbers? The first one would probably give you an indication of suprathrehsold power.
Lastly, NP for the race should be pretty close to your FTP, perhaps a bit lower in this case as it's over an hour