The Gambling Squad when they receive a new member, would have their address without their knowledge given to the syndicates. The syndicates would then place wads of cash in the guy's HDB letter box. Then the corrupt members of the squad will wait if this chap reports it. If no report, then business as usual.
Dr Poh must have waited but nothing was in the letterbox or his local or foreign bank accounts and decided there are no well wishers. So he held a press conference near the nomination centre. How to explain as nothing else makes sense. Don't be surprised if he join Seow Khee Leng who us an expert in this field having worked for 2 govts.