You mean lag between an active game and a live bet then. I do live betting, not on table tennis but a different sport and it works for me. It can be disconcerting as the odds change but its a useful facility to place a bet during a game, I'd be too late often otherwise. I'm not going to argue it can match perfectly especially breaks etc what you see on the screen but I've not had it cause any upset or drastically change without reason. Bets also can be cashed out with some cost to it or to some profit if the odds swung your way at all, apologies if you meant something else.
Terms and Condition of any VIABLE book states, if the ODDS at the TIME are INCORRECT or SCORES in LIVE BETTING. The bet will be VOID. I bet on the match 5-0 and when I looked on Bet365 10 seconds later first set was 12-14.. I was "compensated" 200$ from my 900$ bet. I still haven't been refunded. According to my host he says, "that's the way it is" but I said if it happened the other way around and I abused the system I would get banned. It's normal there is a delay of 2-3 seconds, example I place a bet 5-0 up and once it confirms 5-3.. I get it but not 2-3 minute delayed.. This has been happening since the pandemic started with the increase in table tennis.