[yen223]

The tweet uses "number of companies founded" as a metric, which to me isn't as illustrative as something like revenue/company or similar.

[signatoremo]

This is about startups, which by definition means companies founded in the previous few years, with very little revenue. His metrics make perfect sense. I must say this is a real surprise. Needs to be corroborated by another source.

[mike_hearn]

The original source is the FT citing a company that tracks startups.

[Prbeek]

The owner of that company wrote that FT cited the wrong data