[kadet.89]

I, d recommed to avoid using offsets/signatures where it's not necessary. If a functin has no xref from a vtable than it's not a virtual function and you should use it's signature.
Are you sure these signatures are used in the extension, I don't remember them. There is nothing related to explosion in this extension. player deflection... m.b. it's a rudiment part of tf2db.
Finddatamapinfo is provided by sm API, you dont have to use util