The deduction to which the article refers is the "
educator expense deduction." That deduction is a "carve out" made in explicit recognition of the fact that teachers typically do take money out of their pockets to buy stuff for their students.
To take the deduction, teachers must itemize their deductions. An alternative, if the educator expense deduction is indeed eliminated, is for teachers to record the expenses as unreimbursed business expenses, which also is an itemized deduction, which, insofar as it's classed as a miscellaneous deduction, it is subject to a 2% floor. That may not as good as the educator expense deduction -- I don't know if that deduction also is classed as miscellaneous -- but it's the best I can think of to suggest at this time.
Indeed, I didn't know about the educator expense deduction, but I (my accountant, really) routinely avail myself of the unreimbursed business expense deduction, most especially when I have reimbursable out-of-pocket expenses in the final two weeks of the year and have not yet been reimbursed for them. After all, individual tax returns are filed on a cash basis, so while it's not generally a lot of money, it some money, and I'm not about to pretend that I don't take every deduction and credit for which I'm legitimately eligible, though I'm not much of a "rule stretcher." That is, I'm unwilling to knowingly put myself in debatable position against the IRS whereby to defend an assertion in my tax return, I must take the matter to tax court.