This is a surprisingly one-sided bit of political propaganda for a Slashdot story.
Haulage issues in the UK have been promoted by four factors: first, many non-UK nationals have returned home during the pandemic and our quarantine rules haven't encouraged a return.
Second, the living standards in countries such as Romania, Poland and Bulgaria where such labour came from have risen sharply over the last two decades - the average wage in Romania is ten times what it was, and so leaving and traveling to a foreign country to send money home is no longer so attractive or necessary an option.
Third, the government's changes to IR35 (tax legislation) make contract roles (which this covers; my wife works in haulage and frequently cites this as an issue) less profitable for workers.
And finally, we have Brexit. Which has undoubtedly been a factor, but one of several, and not even the dominant one (that goes to the pandemic). That choice has allowed the government to do exactly what it just did: increase visas when needed, decrease them when it isn't. Before Brexit this wasn't a power the government held on immigration.
This site used to be "news for nerds". I prefer when it sticks to that, rather than spins political news with barely-disguised glee. Or do slanted taked on foreign treaties and immigration patterns now count as some sort of tech development?