It's always good to pay attention to news about the voting process, but the article points out that this isn't anything nefarious:

"The voters whose registrations were deactivated have not voted in the past four years and have not responded to mail from election officials about their registration, according to a statement from the commission.

Every two years, the commission is required by law to identify voters who haven't cast a ballot in at least four years and deactivate their records unless the voters indicate that they wish to remain registered."