The front office is bluffing - wait a few weeks until the schedule is announced and the deadline for renewals passes. More seats will open up then.
Same thing happened last year - they played dumb when I wanted Rockpile/Blue Zone seats saying "they've been sold out for 5 years", and then in May they couldn't stop calling me about how many Blue Zone seats they had available.
They're at 95% renewal from last year right now - that means 5% of last year's season tickets will become available in a few weeks (2500 seats).