This looks wonderful. Pinning for when I can get my hands on some Loquats! :-)
Is there no need for acid in this to be shelf stable?
Sugar is a preservative. This is a canning method that's been used in my family for several generations with no problems. Home canning sparks some passionate opinions, and as with any home-canning recipe from any source, every one should do their homework if they are uncomfortable with the stability. Hope that helps. :-)