Accounting Standards Doubt

Accounting Standards is a general term but in the reference you are talking about is that there were Accounting Standards in India before IFRS were adopted.

And Indian Accounting Standards are IND AS are accounting standards based on IFRS.

IND AS are being made applicable in a phased manner. For entities on which IND AS are not applicable Old Accounting Standards are applicable.

In short Indian Accounting Standards are based on IFRS while old Accounting Standards are not.