Isn't it the case for all humans? as I'm writing this, I can just sense each of my heart beats vibrations, I don't even need to put my finger on my throat
It's hard to phrase because obviously the claim isn't they understand what it is etc.
But even in the dark, even if I can't consciously feel it, I can somehow still sense it.
Certainly if it's beating fast I notice much more than resting.
I think at rest I tend to notice it indirectly, particularly how it makes my body move or noticing it alongside a deep breath.
If for some reason verifying it would actually impact your life, try to find definite proof for it, but otherwise this type of thinking is generally detrimental as you end up with snowflake syndrome and will ignore meaningful statistics or advice as "not applicable to you" when in all likelihood you're just like everyone else.
"some times more than others" means "more than other times", not "more than other people". Meaning that there are times I'm more sensitive to it than other times. It's a sensation that fades into the background most of the time.
It would be totally insane for me to assume I'm especially good at it.