Can I still use my Apple Watch for swimming if it's been opened for repair?
my apple watch SE has been repair (opened) already, can i still use for swimming?
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Apple Watch SE, watchOS 9
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If your Apple Watch repair was performed by Apple or an approved apple Service facility it is likely you would get a fully reconditioned service exchange device with the same water resistance as a new watch.
About Apple Watch water resistance - Apple Support
If the repair was done by a non-certified third party (or you did it yourself) then all bets are off, and you should consider the watch to be at risk of damage from any exposure to moisture.