I agree that NetJets has "only" been around (as a fractional operator) since 1986. That whole 50 year anniversary is a load of marketing bull in my opinion.
However, the order/vs. delivery ratio is not nearly as as bad as CL300 wants to make us believe.
It doesn't take internal memos to know how many planes were ordered/optioned. All involved were usually eager to get those press releases out.
It's true that the cancellations were usually not advertised but it's easy enough to google past orders and compare against publicly available information regarding past and current fleet size.
Of some types NetJets have taken more than the initial orders and of other types less.
NetJets have bought so many Citations and Hawker for example that I don't see how the manufacturers would have suffered from those deals. On the Phenom side of things they have already taken delivery of more than the initial 50 firm orders.