Big mistake: Wenger have made 50,000 substitutions?

Arsenal lost 1-2 at home to Man Utd. One substitution Arsene made surely seemed doubtful to everyone. But I would like to comment on one news that about Aresne's defence on his decision.

The full news can be seen as SKY Sports:

http://www1.skysports.com/football/news/12047/7448943/

The quote is:

"I've been a manager for 30 years and have made 50,000 substitutions. I do not have to justify every decision I make to you (the Press). I stand up for it."

According to Wikipedia, up to 22 January 2012, Wenger has managed 1317 games (since 1984). The maximum substitutions he can make is 1317 * 3 = 3951.The statistic may not be accurate. But even if we assume he managed 2000 games, he can only made 6000 substitutions. There is no near 50000!

As I cannot find the interview video contains such conversation, so I don't know whether this came from Wenger or just the editor put the wrong figure.

In both case, the one with a brain should sense there is something wrong with such 50000! But ironically, such sentence has been quoted on many other website (include bbc).