>Nokia's growth is being limited a lot by WP's own growth right now
According to Nokia they can't manufacture enough to satiate demand (components supply constriction). So even if they had chosen Android, they'd have the same unit sales. "Mr. Elop said the company has experienced supply problems, as certain mobile components have been in short supply, both for Nokia and other phone makers." Unless some of the unavailable components are WP-only, this is the main issue.
It's not about components being WP-only. It's about components where for WP there's just one option, while for Android there are multiple. Specifically they're locked to Qualcomm SOCs, S3s for WP7 and S4s for WP8.
(Everyone but Apple and Samsung have been getting fucked over by Qualcomm's supply issues for almost a year, but at least companies like HTC have an option of using Tegra 3s in countries where LTE isn't a hard requirement. Or even shipping modern software with a semi-obsolete S3 SOC like Sony has been doing.)
That's a fair point. However, I don't think the author had that in mind as they specifically mentioned WP's growth affecting (stunting) Nokia's growth. Still, your point is quite valid.
According to Nokia they can't manufacture enough to satiate demand (components supply constriction). So even if they had chosen Android, they'd have the same unit sales. "Mr. Elop said the company has experienced supply problems, as certain mobile components have been in short supply, both for Nokia and other phone makers." Unless some of the unavailable components are WP-only, this is the main issue.