https://www.drdo.gov.in/drdo/pub/newsletter/2018/Dec_18.pdf
IAF already conducted user trial back in September 2018, You can call it final development trial or user trial because both parties are actively involved in testing. ( Guidelines have been changed for the strategic DRDO's projects, now user and developer have to participate since from beginning to speed up induction )
Paper says missile will be inducted in IAF in 2019. that means, 1 year is needed for production, logistics and signing contracts, not for user trial.
Don't go by some pathetic journalist"s logic. If you apply same logic then Tejas Mk1 yet to be inducted because IAF still evaluating its advantages and deficiencies so it can be used optimally in wartime that's why Tejas yet to be deployed on forwarding bases. same is happing with Astra. These test would be done by User alone without help from DRDO after induction in order to understand their weapon worthiness so it can be used optimally. In case if they find any problem or need an upgrade then they can go back to DRDO anytime. But again you can't say it, user, trial its call post-induction support from the developer