He was in PDX the week prior to summer league and went to the Blazers practice facility, videos on Blazers Instagram of that with his kids and Billups and Cronin and others. Maybe that's when they did physicals to finalize the trade.
My guess is perhaps they were going to do the presser then - but then decided to delay it with the Dame signing and summer league, and now he doesn't want to come back to Portland again just for it.
A bit odd but I can also see where maybe he just doesn't care to do a few days of traveling for a 15min interview. He's 35 and had a number of teams with jerseys so honestly I'm fine with him just staying out until he comes here to get ready for training camp