Johnson’s strike into the bottom corner was originally ruled as offside, as Wales looked set to suffer a third defeat in three Nations League games.
But the video assistant referee intervened, and Johnson was able to celebrate a first goal for his country.
“We chatted with him yesterday and showed him clips on where he can improve and get better,” added Page.
“When players play a certain way at club level, that’s not necessarily how we want to play, it is about him being adaptable, there was nothing about making him a better player from a technical point of view.
“It’s about giving him the most opportunities to create chances.”
Wales now travel to the Netherlands for their last of five international games in just over two weeks, and Johnson will be in line to feature once again.
“When Brennan comes on, depending on if we are chasing the game or not, I think he can drop into that 10 role like Gareth [Bale] does,” said Page.
“He’s done that for Nottingham Forest, but his main asset for me is his pace over the top.
“No defender in world football that would want to see Brennan Johnson coming on with 15 minutes to go.”