Is this a BRITISH accent or an AMERICAN one?

American vowels (east coast) with a delayed frontal presentation of many of the consonants.

It is a native American speaker (probably New York area) affecting an 'English' (RP) accent.

It is bogus. But you already knew that.

......

The 'English' accent which is being imitated is RP, or Received Pronunciation.

RP is not in origin a London accent. It seems to have arisen mainly in English Public Schools (fee-paying schools, what an American would call a private school) during the first half of the nineteenth century.

RP is really an accent without a geographical identity, since it belonged to a specific social class, not to any particular area.

It's American, a caricature of East Coast upper-class / highly-educated speech exemplified by accents like the "Boston Brahmins" or the actor Vincent Price.

This has some elements in common with English RP (which you can think of a "posh UK English" - defined by class rather than region),

The voice of the Crypt Keeper is done by John Kassir, an American actor and voice actor. He's born in Baltimore, Maryland. He seems like the kind of actor who can produce at the drop of a hat a vaguely English accent as traditional in old-school horror movies. But you can still hear he's American.

It is an accent that is used by certain "upper class" Americans, usually educated at Yale, Harvard, etc. It is a fake British accent, which they think makes them sound sophisticated and well educated.

You ask your me these things, of the language. And I not not even the Spanish? Ja ja ja ja