I am guessing they are talking about strategies like Arbitrage Betting, Value Betting or something similar to these kind of strategies. anyway, it would be nice if they could actually list what they consider "recognised betting techniques" so gamblers can avoid doing it in their casino.
It can only be arbitrage betting that gets people's account banned nothing else, and the fact that they mentioned parent company means they could have information of this nature on other platforms which could register this gaming technique!
And btw, arbitrage is a formula so if the numbers do fit in well as in picture perfect, certainly they will not hesitate to flag one's account.
So out of curiosity, what happens to the players funds(deposit) here ??
Interestingly, OP did bet on two casinos rather simultaneously because [his words, summarized] he don't want to risk a casino to confiscate all of his fund. And on that other casino, his account
.
Made me wonder if I still need to take an effort to reach other casino's rep to get a better understanding of his problem, as... we probably already have the answer here.