Sure, but the “four years ago” isn’t really about a specific day 4 years ago, it’s about the state of your life heading into the election. This isn’t going to be an ineffective messaging line for the next month and then switch over to being effective because enough days passed to move the reference point.
I had to look at the timeline on Wikipedia to even remember which month things really hit in different locations. By March 21, CA was under a stay-at-home order, FL was looking for alternatives to sending the sick home, and Ohio had shut down daycares and elderly care centers. It was kicking off. Also happy anniversary to Trump promoting Hydroxychloroquine.
Other notable events, 4 years plus 3 days ago Trump told Bob Woodward he was downplaying the seriousness of the virus because he didn’t want to create a panic. Bob Woodward then sat on that information for six months so he could put it in his book and make more money.