The problem of network latency in live broadcasts on online gambling platforms can indeed be used against a player betting on a match in real time, we cannot know whether an online casino uses the most reliable technologies in terms of signal delivery, but it can also be a high delay on the part of the client's provider.
It is also possible this is on purpose, it is very common on a sport like tennis to have several people trying to cheat casinos, this is done by gamblers which are at the location where a match is going on and they make live bets, they do this because casinos have a delay of a few seconds compared to the actual game before they can verify the results of a bet, and some cheating gamblers can take advantage of this information and beat the casino in this way.
Then it is possible casinos are protecting themselves by delaying on purpose the bets made by their customers, especially if it is one that is going to be resoled during the next seconds to protect themselves from those cheaters.