that is not tx volume, bitcoin transaction volume should be measured on number of transactions not their value in USD specially when you are comparing it over the long term where price has increased dramatically which is the case here. not to mention that we are talking about bitcoin not USD so reporting things in dollar terms is silly on its own to begin with.
And why isn't it matching with blockchain.com data? Am I missing something?
yes, you are missing the fact that a random tweet from a random dude i not a reliable source of information. and OP shouldn't have even linked it here
