They're VC's... so a much higher standard of proof is required to establish integrity. (cough cough Eduardo Saverin)
Gotta remember, all angels and VCs are desperate to increase their "deal flow", that means they need startups to know their name when they go looking for money. So the VC puts on a sort of phoney humility... a kind of "hey we're worth billions but same as you its been hard!" type thing. "Look at how we made mistakes where instead of making tens of billions we only made billions". That way when you are looking for money you might think "Hey those Bessemer guys seemed pretty down to earth, like me!"
It's more like a good PR agency wrote it than 'refreshing'. No one there actually writes... they're al playing golf. It was Sally at the PR agency who wrote the thing that evoked a sense of integrity from you. She needs a pay rise.
