Extremely impressive decipherment results for this script, a long-standing challenge in epigraphy. The methodology seems very sound, and while allographs can make or break confidence in decipherments, their treatment is very convincing and leads to logical and consistent readings. In many ways this is a model treatment of how to set out deciphering an unknown script with a suspected relation to a known language.
This is groundbreaking work, and the language maps back to Sanskrit, and the script pre-Brahmi. A good technical presentation by the author is here: https://www.youtube.com/watch?v=pG7QKoxILwk