Modi had many misses demonetization and GST being top ones in my opinion.
But as far as authoritarianism and tyrannical attitude is concerned Modi does not even belong in the same league as congress party.
Congress party has done everything you have listed and lot more. Tell me if any Modi move comes even half close to what the Congress party did.
1. Took over 25% school capacity from all private schools and enforced severe restrictions in the form of RTE. This alone has closed down 10k + schools in India.
2. Created 100% exemption for Christians and Muslims run private/publicly funded schools from above point 1. They even went to amend Indian constitution (93rd) to create this blatantly bigoted scheme.
3. Congress create NGT National Green Tribunal. A body that reports, investigates and delivers punishment for anything related to environment, their decision can not be challenged in any court. Congress party has made millions through this body. I remember in a particular case where NGT fined this gentleman around Rs 3 crores for building water canals on his own private property. When his representative asked the NGT body "where is the evidence that I have done any harm to environment?" NGT simply stated that they need not provide any evidence at all.
> The central government acting through its appointed state governors has repeatedly tried to snatch power from opposition parties with democratically won majorities.
That is however is not at all true in even a single case. Using governors as thugs was Congress party's modus operandi and now being normalized. BJP government has not snatched any state from a majority party ever, not even once. Congress party on other hand has used their appointed Supreme Court judges to snatch Karnataka from BJP.
I am no fan of Narendra Modi, I personally dislike him for failing to undo the damage Congress party has done to Education related laws. But putting him in the bracket of "authoritarianism" is nothing but elitist snobbery. It is something that a convent educated cheese eating wine drinking socialite from Delhi or South Bombay might easily buy into but not an actually grassroot level worker.