Belated Returns for the following

Return cannot be filed for AY 2018-19 to 2019-20 and also for other as last date was already over. But return may be filed after approval from CIT under condonation of delay u/s 119(2)(b). Penalty will be imposed and If you do not file income tax returns on or before the due date, you would be required to pay interest at the rate of 1 percent for every month, or part of a month, on the amount of tax remaining unpaid as per section 234A

Revised return for AY20-21 can be filed as the time limit has now been extended up to 31/05/2021.

The query string is for whether he can file a revised return.
Because the assess return was filed wrongly.