Others are saying "He lied to parliament about it". But they don't quote him.

How about “It is an astonishing fact that we have 420,000 more people in work than before the pandemic began.”
Boris Johnson, House of Commons 12 JANUARY 2022

When, and I quote from the previously referenced Boris Johnson Lies, the fact is there are more payrolled employees than before the pandemic, the total number of people in paid work - including the self-employed - is below the levels seen just prior to the pandemic. This figure has fallen from 5 million just before the pandemic to 4.3 million as of the third quarter of 2021.

Data from the Office for National Statistics, which includes all people in paid work in the UK, shows that this number is still about half a million below the level just prior to the pandemic. It has gone from about 33 million between December 2019 and February 2020 to 32.5 million in the latest figures from July to September 2021. The proportion of working-age people in employment is also lower than it was in early 2020, falling from 76.6% to 75.4% in this period.

So, there is proof that he lied to parliament. There are plenty more where that came from if you want me to continue but it is just as easy to look it up yourself.