This appears to be more of a hydraulic (nosewheel steering and/or braking) issue than a hard landing. The Kupang incident was the result of the FO under line training, inadvertently putting the left power lever in to beta range when at 100 ft above the runway. The thing just dropped like a brick.
Joy Air is partly owned by AVIC, the manufacturer of the MA60. So even an airline with that level of technical support can have technical issues with this aircraft type.