In my honest opinion, that snake looks too big to be popped 100% accurately. I'm not even seeing the scent glands. Even a female would have 2 roundish pink protrusions on each side that look a bit more fleshy. It also looks like you are not applying enough pressure for such a thick tail.
Try rubbing in and downward rather hard over and over a few times from the tail to the vent with that thumb to work the hemipenes out if there are any.
If you have already done this and you are positive that you applied plenty of pressure and nothing came out, then I'd probe.
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