This is not about just up-scaling an app. Tablets are a completely different form factor which means that from a UX perspective, one needs to think different and create an entirely new UI.
Have a look at different iPhone apps with iPad variants. Oftentimes the iPad version embraces the additional space to offer more or more detailed or very different functionality.<p>The comparisons in question list apps that have specifically been created with this in mind. Apps for Honeycomb that rethought the Phone UI and adapted it to fit the constraints and new possibilities of a tablet.<p>Since, after all, Tablets aren't just blown-up smartphones.<p>What the author of the article implies is that just recompiling a smartphone app for the tablet form factor should count as porting. That's akin to Apple saying they have 100.000 (or what) iPhone 4 apps because people updated the background graphics for the retina display. That would certainly be true, they're still iPhone apps though.<p>Thus, just changing some parameters so that font sizes are corrected doesn't make a smartphone app be a tablet app. The form factor is different.