Besides, what could they have done similarly in this case? Why would they not just be referring to the current spot value of the currencies?
In reality, it's not really feasible to move 45,000 individual grams in a timely manner (especially with products like cannabis that noticeably degrade fairly quickly), not to mention that you'd be opening yourself up to 10,000x the necessary risk to do so.
So while it's true on a certain level that 100 pounds of weed can eventually be worth about a million dollars once it makes its way through a distribution network, in reality it'll only ever probably net maybe 1/4 of that and the majority of that profit won't ever make it back up the chain even in an organized criminal network.
But when the pigs inflate their numbers by pulling these kinds of disingenuous tricks it makes them look good, and they know they'll never get in trouble for doing it.
EDIT: This was specifically addressed in 1993, in amendment 488 to the US sentencing guidelines. https://www.ussc.gov/guidelines/amendment/488.
This 1992 article from the LA Times details some of the consequences — https://www.latimes.com/archives/la-xpm-1992-07-27-mn-4335-s...
You can forbid that specific corrupt practice; but as long as the incentives are to produce a high value, then ways will be found to inflate it to an unrealistic number.
A sell of this size spaced over the say, top 5 exchanges, would likely only cause a 2% price adjustment.
There is a huge huge deal more money than you realize floating about in this space. To give you some idea, take a look at the cryptodollar charts: https://defipulse.com/usd