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Hi Mr.Tangman,
There is some misunderstanding here. Please understand OneDrive for Business is different from OneDrive. The first article you mentioned applies to OneDrive (personal use), which the second applies to OneDrive for Business.
In SharePoint Online and OneDrive for Business, when some documents are deleted, they will be sent to the first-level (Site) Recycle Bin, and be kept there for approximately 90 days. Then, they will be moved to the Second-Stage Recycle Bin for another 90 days before permanently deleted. So we have a total of approximately 180 days for recovery. You can find the detailed behaviors from the article below:
Restore deleted content in the Recycle Bin of a SharePoint site
Note: Second-Stage Recycle Bin is only available for site collection administrators.
When documents are moved to the Second-Stage Recycle Bin, they’re only visible for site collection administrators. For normal users, they look as if they’re deleted.
Regards,
Jiaxing