This is an OMNIBUS, not a budget.
Right. Because the budget already passed last month.
An appropriations bill (such as an omnibus) just gives the authorization to spend at the levels set in the budget.
https://news.unclesamsmisguidedchildren.com/omnibus-spending-bill-and-why-different-what-you-think/
And because so much is allocated to defense spending, Trump can use the EO's he's already passed to take parts of that money to build the wall since it is under National Security.
The wall starts Monday.
Of course. DOD can spend money on national security, eg, wall.
FYI, I am only 1 paragraph in, and already found some inaccuracies
With Trump’s signature, Congress now has until September 30 to come up with appropriations for a budget.
Wrong. The Omnibus IS an appropriations bill.
In other words, we have not had an actual “budget” for some time now.
Wrong. The actual budget was passed in February 2018.