Shouldn't impact Seats.Aero since services are allowed to scrape websites (if that wasn't the case Google wouldn't exist).
I tell everyone, never buy any frequent flyer points regardless of how good the sale is unless and until you have a specific itinerary in mind which has availability. Ideally you want to have the itinerary (and one or two backups) in mind, buy the points then immediately book using said points. With that being said, I have had good luck in finding great value redemptions with Aeroplan including most recently flying from Sydney to Zurich on Virgin Australia/Etihad business, then onwards to Toronto in TAP business, then from LA to Seoul in Asiana business class and lastly Seoul to Sydney in Asiana business class. All for 220,000 points, 160,000 of which were bought from Aeroplan for ~$3000 CAD - a far cry from the cost of an equivalent cash fare!
In terms of point redemptions I would argue that yes Alaska has some sweet spots given the eclectic mix of partners they have for awards (i.e. LATAM to get you into Latin America, StarLux for trips to Taiwan, Singapore Air, EL Al, Condor, etc.) and at least as it stands now the pricing ain't bad either. For instance,
you can fly between North America and Australia in Qantas business class for 55,000 miles one-way. Not bad!
-RooFlyer88