The problem with that "decipherment", from what I've been told by others who are far more educated than I am, is that it does the equivalent of deciphering Anglo-Saxon runnic texts by using modern slang like "yo" in order for it to work out.
As a non-linguist, non-Sankrit speaker I can't evaluate those claims, but considering that this script declines as the Indus Valley Civilization fades away, along with the arrival of Indo-European speakers who would be more likely to speak the ancestor language of Sanskrit, I'd be highly skeptical of these claims.
If the script is a full writing system, and I were forced to guess what a future decipherment might find, it wouldn't surprise me to see that the language is related to the Dravidian languages.
Hopefully more examples of the writing will be found so that we may one day know for sure.
I learned Sanskrit as a kid and I’m familiar with Dravidian languages as well. They’ve heavily influenced and assimilated each other’s features. Although there are no attestations of Dravidian languages before 5th C BCE, we never know what future discoveries might tell about its connection to IVC, if any.
If we can decipher letters from burnt, rolled up scrolls, I’m sure eventually we’ll figure out what IVCs writings meant.
As a non-linguist, non-Sankrit speaker I can't evaluate those claims, but considering that this script declines as the Indus Valley Civilization fades away, along with the arrival of Indo-European speakers who would be more likely to speak the ancestor language of Sanskrit, I'd be highly skeptical of these claims.
If the script is a full writing system, and I were forced to guess what a future decipherment might find, it wouldn't surprise me to see that the language is related to the Dravidian languages.
Hopefully more examples of the writing will be found so that we may one day know for sure.