If he knows that he'll be persecuted and victimized, he'll be an idiot if he stays put in Sinkieland. He challenged the two bozos to sue him in London but they dare not take up the challenge.
Why should the Ridout Bros go through the trouble ? It was just an obstacle that LHY put up for himself ... listen, for himself, not the Ridout Bros. The UK courts may not consider UK a proper forum to hear the case. This is not a physical tort that happened in UK. This is Internet. The intended audience was Singapore and Singaporeans.
Yes, he would have lost in Singapore. But at least Singaporeans and the world would get to hear his arguments, and the Ridout Bros will be ridiculed.
He was not prepared to spend a small fortune (by his standard) to fight for his honour. Nobody expects him to stay put in Singapore. It's a civil case, and all he needs is to give a Power of Attorney to a lawyer in Singapore to fight his case. The Ridout Bros and the Court were even prepared to let him give testimony via Facebook live.