I disagree with you on this.
The Costa goal is debatable, it could go any way.
But the Penalty against Nigeria is definitely a penalty, Ekong's hands were all around Mario's body, the defender was so stupid and still didn't leave him till the corner was played and he still didn't leave him till he go to the ground.
Infact, one don't need a VAR for that.
in most of cases referees didn't give penalties for that contact ,but still even with videos they can't judge so it's better to let the game go on .