Goodness I never thought of that.
But no, there’s absolutely NO reason to think he only killed twice.
This fellow is bad. And he’s been all over the world, Thailand, Netherlands, Chile.
Sure, he could have killed several times. I’d think any strange disappearances of females from where he’s been should be looked into.
There is no reason to think his crimes were limited to murder. He had to make his gambling money from somewhere. Why not kidnapping then selling girls.