The promotion seems well alive with an extension due to covid-19.
Email received today:
Thank you for your status match registration to KrisFlyer Elite Silver membership tier on XX December 2019.
In view of the COVID-19 situation, KrisFlyer will be extending the qualifying period for you to achieve an accelerated upgrade to KrisFlyer Elite Gold status by an additional 3 months.
Instead of the original 4 months, simply fly 3 eligible Singapore Airlines or SilkAir flight within 7 months from your status match registration date to qualify for an accelerated upgrade to KrisFlyer Elite Gold status.
Thank you for your support and we hope to see you on board our flights soon.
Yours Sincerely,
KrisFlyer Membership Services
Wondering for how long SQ will give the Gold status if let's say I complete my challenge in July.