Solstice Sleigh - restore health or add health?

https://preview.redd.it/mmy9bizsvs9h1.jpg?width=447&format=pjpg&auto=webp&s=3ef9f29796dd90916502f43b778897f75fee143c

So the ingame description says "restores Health"
but the wiki says "gain bonus health"

I wondering which of these is correct and can it proc Diadem of Songs passive healing?

I want to try out new builds to see if something works well and with some, the slow is proc-able consistently with most of picks, so it would be wonderful if it would work with the Diadem.