He reviewed the tank crews involved in the match and encourage them.
The tankmen who were greatly encouraged by the great brilliant commander's inspection, an expression of his deep trust, alongside their glorious colors on the training ground, extended deep gratitude to him.
After reviewing the tank crews, he mounted a new-type main battle tank, took the control lever and drove the tank himself, adding to the high militant spirit of the tankmen and instilling in them thoroughgoing outlooks on the enemy and war.
All the officers and men of the tank units raised stormy cheers of hurrah, looking up to the invincible and iron-willed brilliant commander.
http://kcna.kp/en/article/q/35dcef68b38b7556f7eb3ca1828d39d7.kcmsf
mirror https://kcnawatch.org/newstream/1710400279-521738616/respected-comrade-kim-jong-un-guides-tankmens-training-match/
From March 4 to March 14, South Korea (ROK) and the United States have been doing a military operation on the border of DPRK called Freedom Shield. I would think that this tank exercise by the DPRK is meant to deter the US and ROK from invading DPRK.
KCNA is a website operated by the DPRK government. The article does call the exercise a training match and the Seoul Ryu Kyong Su Guards 105th Tank Division won the match, so it was a competitive exercise. There is an album of 30 photos attached to the article.
Oh, I know this is part of their greater set of military exercises and military readiness, I was making a joke.