"Update: The official end date to sign-up for this offer is 4/4/19 (and will not be extended again). Plans will remain active for one year from your sign-up date (promotion discount will be retired in full on 4/30/2020)."
"If you've been waiting to take advantage of this popular deal, you may want to act soon since word on the street is that this promotion will stop accepting new sign-ups around the early part of April 2019. "
This articles is basically an advertisement by Sprint and I can infer that it was sourced with Sprint and that "word on the street" refers to a Sprint marketing person who deals with SlickDeals.
Can you kindly confirm that the offer will be closing to new signups on April 4?