Simo Ahava confirms that Safari’s 14s Intelligent Tracking Prevention does not blog tracking using GA (via Daring Fireball).
For better or for worse, one of the previews showed that google-analytics.com is listed among the trackers that are being prevented on websites.
Queue panic and the spread of misinformation like wildfire through the dry brush of first-party analytics.
I was under the impression that the forthcoming version of Safari was just ratting out trackers to users not preventing them.