Maybe yes maybe no.
The battery does not seem swollen, a priori.
Inserting the battery must be straightforward by pushing it in "sharply".
Does it do the same when you put the battery in the other slot?
Remember to clean the battery and charger contacts with an electronic contact cleaner.
If in the other slot the values are correct or read, maybe a failure of the charger.
Each cell should be tested with a tester to see if the fourth cell is at 2.54. If it is this value, I fear that it is dead because it is well below 3 volts.