Your instinct about past performance is well-placed, and the specific data point you found, a 22-month delay and 310 basis points below pro forma, is exactly the kind of signal that matters more than a sensitivity table.
Here is why: a sensitivity table shows you what the sponsor wants you to think about. It is built by them, uses assumptions they chose, and models scenarios they consider plausible. A completed deal from a real market cycle shows you what actually happened when things went sideways, and whether the sponsor communicated problems early or buried them.
A few things worth checking on that 2019 exit. Who absorbed the delay cost, the investor or the sponsor? Did investors receive any interim communication when the timeline slipped, or did they learn about it at exit? How did actual cash distributions compare to the projected schedule, not just the final return? Those answers tell you about operator character, not just operator competence.
One thing you may not have asked: the offering documents for an OZ fund have reporting requirements under the updated rules, but disclosure of a sponsor's prior non-OZ performance is largely voluntary in format and emphasis. There is no standardised prior-performance table required the way some other pooled investment structures impose. So the absence of that 2019 deal in the materials is not accidental. I would ask for a full prior-performance schedule directly, in writing, covering all projects the principals managed, not just OZ-specific ones. If they hesitate, that is data too.
I am not in a position to say whether that 310 basis point gap is disqualifying, because it depends on what caused it and how they responded. A lawyer or financial adviser who reviews private fund offerings can help you read the offering documents with that history in mind.
What was the asset type on that 2019 deal, and do you know if the same principals are leading the current fund?