In the context of the article, this type of trust you linked has got to be the special case of all special cases.

Since that trust is tracking the S&P 500, it has to be literally equivalent to its VOO ETF counterpart. If it ever rebalanced in a way that no longer tracked the S&P, or even mysteriously changed disclosure in some way, investors would dump it the next day (for an index fund that is literally the same except for expense ratio and disclosure rules).

Moreover, everything in that trust is quite obviously publicly traded companies. The article is about retirement funds gaining access to private markets[1].

tldr; this ain't that.

1: clarification edit. Also, my gut tells me I should have written that as "private markets gaining access to retirement funds" but I really don't know enough about it.