Those are all major strategic investments into open-source, at a time where companies like Microsoft, Google and Amazon were not making any comparable investments that I can think of. For example, in 2005 Android was freshly acquired by Google, Chrome was still 3 years away. Go was introduced in 2009.
One exception I can think of is IBM which invested heavily in Linux around the same time Apple was open-sourcing Darwin.
Overall, their claim is arguable but certainly not without merit.
EDIT: remember when IBM covered the streets of San Francisco in Linux graffiti, and were threatened with a huge fine when the paint didn't wash off as planned? http://usatoday30.usatoday.com/tech/news/2001-04-25-ibm-linu...