If you saw them both play all of their careers you would draw different conclusions.

Jordan brought it every night. If his team was up 2-0 in a series he didn't play less than if the series was 3-3.

One of the things your article looked at was playoff games when facing elimination. If you look at his career closely, you realize this was mostly in the early years of his career. After the Bulls got going, they they were famous for NOT letting a series go to its full limit. They didn't face many elimination games.

The majority of his playoff games where he did face elimination were when he was younger.
His rookie year they lost to the Bucks 3 games to 1. The next 2 years they were was swept by Boston. A really good Boston team.
In 1988, 1989, and 1990 they ultimately lost to a good Pistons team. If you saw those playoffs you wouldn't say he wasn't clutch. He was really good. The Pistons were better. Anyone following those did not have any inclination that he faded when facing elimination. His play in these series helped propel his stardom.
Before reaching the Pistons they faced Cleveland in 88 and 89 and went a full series facing elimination both times. One of his early famous moments was beating Cleveland on a buzzer beater. He seemed pretty clutch.

Again, those few years at the beginning provide most of the data for when he faced elimination games. After that, the Bulls started to win championships and they dominated. They beat some good teams too.

After 1990, his teams only faced an elimination game 3 more times in his career.
They didn't face any in 1991 and won their first championship.
They went a full series against NY in 1992. When they lost game 6 Jordan scored less than usual, but nobody had the feeling he choked or failed to show up. Not at all. Knicks were tough and it was a tough series. The Bulls went on to win the championship.
They didn't face any elimination game in 1993.
Then he retired. He came back and lost to Orlando in 1995. That wasn't a great year for him, the only exception. But watching every game that year (not just playoffs), it wasn't surprising. He was not the same as before retirement. He had surprising moments but not the same. He must have used that as motivation during the off-season. The next season they became the most dominant team of all time.
They didn't face any elimination games in 1996 or 1997.
They went a full series in 1998 against Indiana. His game 6 when they failed to eliminate Indiana was a good game. Then they won game 7, then they defeated the Jazz in the finals.

Having watched both Jordan and Lebron, Jordan was more consistently dominant.