That's an overstatement. NSE generates the data
Anyway, HDFC High is clearly showing on their page.
Who is right wrong is secondary, but a guidance to the poster to use the most obvious source.
Otherwise wait for EoD when data is reconciled and distributed.
Even the authorized data vendors miss ticks. That's how the system is (snapshotting). On some other occasion Fyers may miss a tick.
They also have to adjust eod.
Now we'll wait for EoD Bhavcopy to come.