Help with citizenship by descent question - Foreign citizenship

Grandparent:

• ⁠Sex: Male • ⁠Date, place of birth: 1923, Poland (drohobyz) • ⁠Date married: 1944 England • ⁠Citizenship of spouse: British • ⁠Date divorced: N/A • ⁠Occupation: engineer (never English public service) • ⁠Allegiance and dates of military service: Polish Resettlement Corp (have documentation confirming Polish military (under British command) not British army

(If applicable)

• ⁠Date, destination for emigration: 1957 Canada • ⁠Date naturalized: 1967 Canada

Parent:

• ⁠Sex: male • ⁠Date, place of birth: 1959 Canada • ⁠Date married: 1988 • ⁠Date divorced: N/A

You:

• ⁠Date, place of birth: 1991, Canada

Lexmotion completed their search and found his polish records (birth certificates and school certificates in Poland) I have all birth/ marriage certificates for me, dad and him. BUT they are asking for his naturalisation record in Canada (I have death certificate 1970)

Will this document mean he is no longer polish since he acquired foreign citizenship in 1967? Does this affect my application (I haven’t applied yet) thanks!