I guess this is not a good idea.
One can quickly figure out that the day’s pageviews seem to be lower than usual because the day isn’t over yet - but if you delete it, it will be very difficult for the admin to notice the anomaly.
I have a forum that has been DDoS’ed several times. Thanks to Cloudflare for making it survive ddos - but anyway, sometimes, after being ddos, I can quickly see up to tens of thousands of anonymous visits on the dashboard. This allows us to quickly confirm the nature rather than waiting for analysis from a technician and then troubleshooting.