How do I remove this permission?

I use a Samsung Galaxy phone, and use GBoard. Had a chat with someone on Whatsapp and the person mentioned to call at 7:30 pm. I was setting a reminder (using the standard app from Galaxy store) and on opening the app, I get a suggestion to set a meeting at 7:30 with the caption "suggestion from WhatsApp". (Can't attach pics on the sub)

When did Samsung get access to WhatsApp texts, and how do I remove it?

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