You can’t use print for that. Print prints lists of items, with all their properties. You have to find the items, extract the properties you want, and put them.
:foreach ITEM in=[/ip hotspot user find profile="0300kbps" or profile="0600kbps" or profile="0750kbps" or profile="0900kbps" or profile="1200kbps"] do={
:local COMMENT [/ip hotpost user get $ITEM comment];
:put "$COMMENT";
}