There is nothing to worry about, it's not a malware. It's just a leftover startup entry that wasn't removed while uninstalling the app.
Right-click any of the headers on the top of Task Manager's Startup tab > choose Command line > expand the full location > go to the location shown and delete the folder / file related to the app there.
Or, press Win key + R > type regedit and press Enter > click Yes when prompted > click on the address bar in the window and paste this address, then press Enter:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
Right-click the key on the right side of the app and choose Delete, proceed to delete the key.
Restart your device and check again.