A Sikh at my university was sure he would someday decipher the Indus Valley script. Unfortunately he passed away before being able to win the Stalin Prize.
Tough nut to crack unless it’s based on a regularized alphabet. Egyptian hieroglyphics might still be uncracked if the Rosetta Stone hadn’t provided hieroglyphics and the corresponding Hellenistic Greek and/or Demotic texts.
There are clues near the top of the page on understanding this cursive handwriting.
https://tinyurl.com/4txh4xcr