Yes, that is a cabinet minister (and leading Brexiteer) tweeting in what can only be described as a mock version of MLE (multicultural London English), a dialect which is influenced by cockney merged with elements of English spoken in the Caribbean, Indian Subcontinent and parts of Africa.
MLE is mainly spoken by young working class people... basically, not Michael Gove.
The meltdown was in response to Angela Rayner's kind of iconic tweet that Michael Gove is "crap at both" – meaning being a rapper, and a political analyst.
It's all part of Gove's beef with Stormzy, who is a vocal Labour supporter.
And Michael Gove is crap at both 😜 https://t.co/UgCLL94lwB