Most successful cases of disinformation typically combine a real fact, which would be than heavily recontextualized and manipulated, plus multiple outright fakes that allegedly stem from a doctored “kernel of truth”.
This news clip is a perfect example of the formula: Poland indeed cancelled the referendums and did not ratify Treaty establishing a Constitution for Europe; however, it was not the only EU-country to do so and that decision came after the document was rejected by French and Dutch voters.
Conspiracies about Poland being an Anglo-Saxon agent that infiltrated the EU to offset Germany and other nonsensical claims are thus legitimized by inclusion of an out-of-context manipulated factual statement.