Safari Website Data in Settings

We have a new ipad Pro (two days old) I was checking out some privacy settings and such due to children, (settings/safari/advanced website data) I noticed 30 MB of data next to whatsapp.net (to me means the web version not app) This ipad is synched to an iphone. Our family created a group whatsapp to go on a cruise in 2020-21, but we have not used it since, and I'm the only one that apparently still has it when I go to invite my iphone contacts to whats app, all family members are "available for invite" meaning they are not on whatsapp? I haven't used it in a couple of years either. My iphone is not the phone that is synched. I've checked our app downloads, hidden apps etc. and no one has whatsapp but me. It is my understanding even if you try to use whatsapp on website, you would still have to use your app from iphone to link acct to whatsapp web. I am so confused why a brand new ipad would show 30 MB of whats app activity for that website. Could it be left over from that long ago? 2020 ish? I know embedded links and ads can show in website data, but 30 MB??