President Biden signed order to wear masks in national parks and himself didn't wear mask when visiting Lincoln Memorial

Within hours after Joe Biden swore as the 46th President of the U.S., the 79-year-old Democrat signed several executive orders one of which was new coronavirus mandates, including to wear masks on federal property and for interstate travel.
President-elect Joe Biden plans to sign 17 executive actions today in the Oval Office including:
— Yamiche Alcindor (@Yamiche) January 20, 2021
-National mask mandate
-Establish a WH COVID-19 team
-Cease withdrawal from WHO
-Restore national security pandemics office
-Extend pause on student loan payments and interest
According to the newly signed executive order, now both federal employees and visitors are required to “wear masks, maintain physical distance” everywhere from national parks to federal monuments and other federal lands.
"It is the policy of my Administration to halt the spread of coronavirus… by relying on the best available data and science-based public health measures," Biden wrote in his executive order. "Put simply, masks and other public health measures reduce the spread of the disease, particularly when communities make widespread use of such measures, and thus save lives."
Wearing masks isn't a partisan issue — it's a patriotic act that can save countless lives. That's why I signed an executive order today issuing a mask mandate on federal property. It's time to mask up, America.
— President Biden (@POTUS) January 21, 2021
But what happened when Joe Biden himself visited the federal property? Right, President Biden didn’t wear a mask when he arrived at Lincoln Memorial in Washington D.C. on the inauguration night.
Biden signed a mask mandate requiring everyone who is on federal land to have to wear masks.
— Ryan Saavedra (@RealSaavedra) January 21, 2021
Here is Biden tonight at the Lincoln Memorial, which is on federal land, not wearing a mask: https://t.co/Q1T01mrq29
For whom these orders were made?