Yes, if you delete the SharePoint Online site associated with a Microsoft Teams team, the entire MS Team will also be deleted. This is because the SharePoint site is an integral part of the Microsoft 365 Group that supports the Teams functionality.
delete a SharePoint Online site

JulieMardersdw214
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If I delete a SharePoint Online site that was created by an MS Teams team, will the MS Team get deleted as well?
Microsoft Teams | Microsoft Teams for business | Other
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Henry Xing 0 Reputation points
2024-12-23T14:31:42.65+00:00 Yes the corresponding MS Teams team will get deleted as well, because it is part of the same M365 group as the Sharepoint site
https://learn.microsoft.com/en-us/microsoftteams/office-365-groups