The Flamingo definitely reopened.

However in the last year or so, I have no idea how they market the place, since their website is down and they no longer seem to be listed on the main booking sites. Where they are listed, there is no room availability.
Yet, they were open & doing business a few months ago, when I was last in Pattaya. How long they will carry on for is another question.

e-male addresses WERE:
oui_jeera@hotmail.com

info@flamingo-pattaya.com