Reincarnation Link Summon is a method of Link Summoning that uses a Link Monster as a Link Material to Link Summon another copy of the same monster. This type of Summon was first performed by Soulburner in Yu-Gi-Oh! VRAINS.
A Reincarnation Link Summon with "Salamangreat Sanctuary" is not performed through a circuit portal, but through a magic circle created by the Field Spell Card. The material turns into a steam of fire that enters the circle, from which the newly summoned monster emerges.
As proclaimed by Soulburner, it's the new potential of Link Summon.