Paradox czech data - injections Covid19 - shedding on 0-4 y

Hervé Seligmann analyzes data from Czech health insurance files collected in an article stating that mortality among those over 50 years-old is double among those who have not been injected.
He notes an arithmetic paradox from which he deduces that possibly the injected deaths were partly classified as non-injected. He emphasizes that the mortality of those not injected is proportional to the injections while it is not for those injected.
Finally, he found a correlation between the injection of those over 5 years old and the mortality of those under 4 years old.