We see no virus warnings of this type here, though we do not use Avast. And given that MCUXpresso IDE v10.2.1 was released back in July - we would have been flooded by complaints by now if there was a real issue.
Both of the exe's you reference are related to debugging and make use of localhost network connections (though J-Link debug does too). Maybe this could be triggering a firewall related warning in your system.
Regards,
MCUXpresso IDE Support