I have one of those corers. I love it but my husband says all the juice of the pineapple ends up in the bottom of the shell and causes the slices to be dry.
I haven’t found that to be the case. You can do it in/over a large bowl or plastic container that retains the juice; and if you screw it down to the very bottom so that it pokes through the end, all the juice pours out - though you don’t want to do that, if you want to use the rind as a “container.”
It takes some practice to make it work for you; but I’m sold on it.