Well, now they're back, after a fashion. Not delphidabbler.com just yet, but as a GitHub pages micro-site. Check it out at https://delphidabbler.github.io/delphi-tips.
There's no search as yet, but all 234 tips are there.
I do intend to reintegrate the site into delphidabbler.com one day, but given how much needs doing with the new site, who knows when that'll be.
So if anyone wants to improve the micro site, please fork delphidabbler/delphi-tips and code away!