No. In fact, they are great time to start a company, and this is not just conjecture: the Founder Institute was founded in April 2009, during the "Great Recession".
Obviously, recessions are extremely challenging times for established businesses, and as a result, their contractors, partners, and employees. The macroeconomic and personal devastation caused by downturns cannot be overstated. They literally change the world.
However, if you are going to try to find a positive in the all the pain recessions cause, it is the opportunity for idea-stage, pre-seed, and nimble CEOs to quickly adapt and build products that resonate in the changing market. During a recession, large companies will move slow, talent is readily available, and the normal costs of real estate/ goods/ services is significantly lower. Many of the world's largest tech companies used these benefits to their advantage to launch and get traction during an economic downturn, such as Apple, Microsoft, IBM, Udemy, etc.
"Be fearful when others are greedy, and be greedy when others are fearful" - Warren Buffet
See more info on why a recession is a great time to launch a startup: https://fi.co/insight/why-a-recession-is-a-great-time-to-launch-a-startup