The statement
“Flu has disappeared worldwide during the COVID pandemic.
Since the novel coronavirus began its global spread, influenza cases reported to the World Health Organization have dropped to minuscule levels. The reason, epidemiologists think, is that the public health measures taken to keep the coronavirus from spreading also stop the flu. Influenza viruses are transmitted in much the same way as SARS-CoV-2, but they are less effective at jumping from host to host.
As Scientific American reported last fall, the drop-off in flu numbers was both swift and universal. Since then, cases have stayed remarkably low. “There’s just no flu circulating,” says Greg Poland, who has studied the disease at the Mayo Clinic for decades. The U.S. saw about 600 deaths from influenza during the 2020-2021 flu season. In comparison, the Centers for Disease Control and Prevention estimated there were roughly 22,000 deaths in the prior season and 34,000 two seasons ago.
The author goes on to explain (probably laughing all the time) that the treatments for Covid are working remarkably well against flu and influenza. Of course, the main treatment is the quarantine, masks, and “social distancing.” The jab has only come recently and is only serving to spread disease, as they discovered in India.
The article goes on to say,
Public health experts are grateful for the reprieve. Some are also worried about a lost immune response, however. If influenza subsides for several years, today’s toddlers could miss a chance to have an early-age response imprinted on their immune system. That could be good or bad, depending on what strains circulate during the rest of their life.
More laughs! They are more worried that Pfizer might not sell as many vax’s. Their profits might drop by billions of dollars. It used to be that children got immunity by exposing themselves to certain diseases, such as chicken pox. But that was too cheap.
According to Dr. Jim Willie, the World Health Organization (WHO) recently published a chart showing how flu cases have dropped dramatically in the 2020-2021 flu season (winter).

Was this due to the masks and social distancing? Hardly. If that had worked, then it would have worked equally well on Covid-19 cases. More likely, it worked because flu and influenza were being labelled as Covid-19, along with a multitude of other conditions such as heart attacks, car accidents, shark attacks, and old age.”
The Source
Scientific American, 29 April 2021
(https://www.scientificamerican.com/article/flu-has-disappeared-worldwide-during-the-covid-pandemic/)
as discussed by Dr Stephen Jones
(https://godskingdom.org/blog/2021/05/covid-is-the-cure-for-flu-and-influenza )
My take on it
Here’s a complementary picture, from the same (WHO) source:

(See https://www.who.int/influenza/gisrs_laboratory/updates/flunet_globalviruscirculation_20210212.pdf )
The official explanations as given in Scientific American strike me as ludicrous.
One could theorise that the people who would otherwise have succumbed to the flu, during that period, succumbed instead to the Covid virus, simply because it got there first. That theory doesn’t appeal to me either.
The most logical explanation, as Dr Jones says, is mis-attribution. And what I have read supports that thesis, precisely because the WHO and other actors evidently encouraged it.