That's absurd.
JSDoc is a comment formatting standard.
The tooling used to parse it is independent.
In the same vein, a file of ISO C++ (take any version) code is not "GNU C++".
By "JSDoc is TypeScript", culi means "JSDoc syntax and TypeScript syntax are two alternative ways to describe types to the TypeScript compiler/language services, and the two syntaxes have nearly-identical expressive power".
By "JSDoc is TypeScript", culi means "JSDoc syntax and TypeScript syntax are two alternative ways to describe types to the TypeScript compiler/language services, and the two syntaxes have nearly-identical expressive power".