While this font is said to be “single line”, it is not. It is built using a closed shape conversion which the seller demonstrates on the site link you provided.
LightBurn now supports true single line fonts known as SHX fonts, of which there are many available.
Can you email the SVG in question to support@lightburnsoftware.com so I can have a look? If the text is converted to curves before exporting, it should just work.
SHX fonts are not system fonts so there is a different process than you might be used to. These fonts do not get installed nor are they available from Font Book. You simply place the SHX file(s) in a directory, then tell LightBurn where to look for these files.