I couldn't disagree more with that statement, and not just for ideological reasons. By the time that Sun started really embracing open-source, Sun had been abandoned by everybody except for its longtime customers who already had a very substantial investment in the platform.
A lot of Sun's open-sourced projects attracted a great deal of attention by myself, and many others in the Sysadmin world. Projects like ZFS, and Xen/xVM made it pretty clear that Sun had some of the best people in the industry working for them, and that Solaris was probably worth reconsidering, even if it meant being coupled with Sun's expensive hardware (which is a drop in the bucket compared to the extra staffing costs associated with a high-maintenance server platform). Also, the existence of OpenSolaris meant that we could take the platform for a "test drive" on some old hardware before taking the plunge.
By the time that Sun had won us over, the writing was already on the wall w.r.t. the Oracle acquisition, and nobody would go near Sun with a 39 1/2 foot pole (which, as we've found out, was a perfectly justifiable paranoia).