No issues when I tried just now. Both through my normal bookmark, and also, you can pull any address in new reddit and just replace the "www" with "old" to go right to the old version of that page.
I have been having that problem for months, it comes and goes. Never tried turning off adblockers though. I just opened the site, was able to browse for a bit and then got hit with the CDN issue. It usually is back to normal in a bit. But it looks like they have depriorotizing old.reddit for a while now.