This is science NOT opinion.
The most basic way to test this thesis is by direct comparison. As of 6 April, seven US states had not adopted shelter-in place orders and their stats are in line with those that did even when adjusting for population density.
Open the country!
Depends on what our sheltering in place was supposed to accomplish.
If we sheltered in place:
1) So as to give modern medicine time to find a treatment,
2) To allow our hospitals to procure enough PPE and equipment, test kits, and get supply chains built up
3) To reduce the number of people infected from the initial exposures, so that we did not overwhelm hospital staff and facilities.
Then I think the shelter in place worked to some extent. We probably allowed it to go on too long. We really need to get back to work, albeit still observing mitigation practices.
The article was correct, we allowed a select few doctors, high on hubris, to cite really bad data, and grossly exaggerate the threat, the deaths and the spread of the infection. We also allowed politicians to get high on the feeling of power, to order their citizens around like year old toddlers, and allowed other politicians to loot the treasury.