Rule question concering a stradlle and blind raise

[Dynasty]

Today, I came across a situation at the Monte Carlo that I have never seen before. A player in my game was straddling and raising his own straddle before any action pre-flop.

Let me give an example. In a 10-20 game, he would be posting $20 as a straddle and putting up an additional $10 ($30 total) and announcing that the $10 was a raise of his straddle. If a player wanted to enter the pot pre-flop, they only had to call $20. The raise became "official" when the action got back to the straddler. That's when the $10 raise kicked in and everybody would have to call $10 more.

I asked the dealer if this was allowed. Specifically, I asked if the raise was irrevocable. The dealer said it was okay and that the straddler could not take back the $10 raise.

Who has encountered this before?

And, yes, I was praying to see AA on one of those hands so that I could limp-4bet. Sadly, it never happened.