Your math is right, and I want to explain the mechanism so you can see exactly where the gap lives.
"Interconnection study" refers to the process a utility runs to figure out whether the local grid can actually deliver power to a new facility, and if not, what upgrades are required and who pays for them. That study has to complete before power delivery is confirmed. Thirty-eight months out means the utility has not yet said yes, how much, or at what cost.
"Substantially de-risked" is doing a lot of work there. A study underway is meaningfully different from a study complete. The study completing is also different from power actually flowing. A developer can clear the study and still face years of physical infrastructure work before a megawatt arrives on site.
The month-19 distribution projection is the part I would want a very specific answer to. Distributions to passive investors typically come from revenue, and a data center does not generate revenue until tenants are operating, which requires power. If power is not confirmed until month 38 at the earliest, a month-19 distribution either assumes power arrives early, or it comes from a different source, such as a capital reserve or a fee structure, rather than from operations. Those are very different things, and a prospective investor has every right to ask which one it is, in writing, with the underlying assumption named.
Your probate instinct is sound. Language that softens timeline risk does not change the timeline.
A tax or securities attorney should review any fund documents before you invest. That is a one-sentence point but it matters here.
One thing worth naming: the Rena strategy guide on data centers flags power delivery as the central site-selection factor and a genuine bottleneck. "Secured power" is the phrase it uses for the attribute that actually holds value. An interconnection study in progress is not secured power.
What did the fund documents say about what triggers the first distribution?