The idea is that if you accept the fact that your loved ones may disappear at any time, you’ll appreciate them and love them more in the present. And when they do disappear, feeling that sadness is part of being human. The important thing is to accept that they’re gone, and not wallow in despair, as it’s something you can’t change.
I dunno, your “amplify love” interpretation seems diametrically opposed to the “curb pleasure” writing of the stoic philosophers