The phrase "about the substantive" is correct and usable in written English.
It can be used when discussing the essential or fundamental aspects of a topic or subject matter.
Example: "In our meeting, we need to focus on the issues that are about the substantive aspects of the project."
Alternatives: "regarding the essential" or "concerning the fundamental".
This case, however, is not about the substantive challenges to the WOTUS Rule.
Thus, this is a case in which there is no dispute about the substantive law.
Sanders was receptive to the recommendations about the substantive proposals about which bills to support, and which amendment made sense.
"The Fresh Start project carries the support of over 100 MPs and is about the substantive issue of EU reform," she replied when asked about the letter.
Much has been written recently about the substantive and statistical requirements for applying sound methodology to this problem (Gelenberg and Chesen 2000; Leon 2001).
That kind of stuff only angers them because they think that green groups don't seem to care about the substantive stuff.
Setting aside procedural questions about standing, the substantive outcome of MTE means that platform defendants should be able to raise users' rights in national courts.
So we remain confident about any decision on the substantive merits of the plan.
But he did less quipping, speaking instead about more substantive matters, like the history of the Tchaikovsky Violin Concerto, or Glazunov's place in the pantheon of late-19th- and early-20th-century composers (second level but not to be dismissed lightly).
Trump then slyly backed off for a moment and talked about the familiar substantive issues of trade, China, and the economy.
Complexities thus arose in deciding whether the studies were about the same substantive concept of quality of life or were tapping into a separate but overlapping concept.
