You don't have to use Lever (just noped out of using them at our company bc they don't put any pricing data on their website + refused to answer simple questions over email, insisting on a "sales call", which is an even clearer indicator of a company which doesn't value my time than one which does not reply to an application altogether) – there are plugins like Streak which can make this effortless.
If you are experiencing an influx of unqualified candidates, you might also consider making your requirements much more explicit, although you'll still get people trying their luck.
OP was writing about interviewees, not applicants:
“In order for it to be ghosting, the ghosted party has to expect the conversation will continue. This means that if you apply and never hear back from a job, that’s not ghosting, a conversation never started. It only becomes ghosting when there is an expected next step that never happens.”
The article is specifically talking about ghosting people after a mutual process has been started, such as after an interview or coding assignment.
While I’d love personalized feedback, all I really want is for your Applicant Tracking System to fire off a short email from noreply@company.com, bcc’ing everyone other than the person getting an offer.
Subject: Your Application to $company
I regret to inform you that $position at $company has been filled by another candidate. We appreciate your interest in working with us.
[Add other platitudes, info about reapplying or whether you’ll be considered for other jobs here…if you want].
—- $Name or HR department
If you’re too pressed for time to do that…maybe you should be hiring someone who can.