With a UK population of around 58.2 million the risk of being struck by lightning (indoors and outdoors combined) is one person in 1.2 million and the risk of being struck and killed by lightning is one person in 19 million.
That is regardless of age there is a 0.000083% chance of being struck by lightning and a 0.000005% chance of dying from it. In the specific age group of under 20 then the percentage risk would be even lower.
Based on the university of Cambridge analysis attached the 16% of 5-14 year olds and 13% of 15-24 year olds have been infected by Covid 19. For those it has been fatal in 0.001% and 0.0039% of cases respectively.
So it's not true.
https://www.mrc-bsu.cam.ac.uk/now-casting/
https://www.researchgate.net/publica..._two_databases