Its entirely possible for democratic systems to be authoritarian.

Sri Lanka is a democracy, in that they have elections, but it is also hilariously corrupt, with extremely authoritarian governance.

Which country isn't corrupt? I know many nations that are more corrupt than Srilanka. The major difference is Srilanka depended on tourism which led to this downfall.

Regarding the authoritarian governance, can you please supply the valid examples? Srilanka is just one example. There are many countries like Bhutan, Nepal which seems to be sliding day by day. I hope we won't label them authoritarian when they fail?

Democracy is not immune as people expect. We can't label demagouge who sways people as authoritarian. Democracy is only sucessful if majority of people aren't biased and vote based on merit rather than religion, greed etc.

this is not possible as 'authoritarian' is described as opposite to 'democratic'. Witness the recent posture of US alliance building / NATO to Asia pivoting / Anti-BRI funding.