Woah, I thought this thread was dead in the water by now but I guess not
And yes, the first post was made in May 2013, but the gamercard's get replaced when you regenerate them, which means anywhere they're shown they will be updated as well.
For example, any images with the URL below with the same parameters would now show the new updated version.
http://armorwatcher.com/gamercard/v1/normal/AssaultCommand_blue_1.png
It used to get the stats live on each load, so that everytime you loaded a gamercard it got all the data to display. This system was fun but caused me to run out of CPU on the server so I had to move to a paid host, after that, I still kept running out of CPU even when I made it save the images only on generation. But now I do not need to worry about that because Bigstack is hosting it for free. He owns HaloCustoms.com and runs his own hosting company and the uptime and support is impeccable.