Edit: As is also mentioned in the update to the article.
"Platinum membership is $500,000 per year."
"including fellow Platinum members IBM, Oracle, Intel, Fujitsu and Qualcomm Innovation Center"
So Linux Foundation is getting at least 3MM USD per year now.
7 platinums * $500k = $3,5MM
15 golds * $100k = $1,5MM
110 silvers * between $5k and $20k = between $550k and $2,2MM
Total = between 5,5MM and 7,2MM
Edit: As is also mentioned in the update to the article.