The name of this product is "vimplugin". It is by its nature a plugin, that is, it is integrated in to an existing product.
Due to the viral nature of the GPL, this means that Eclipse itself would need to be GPLed, and then all addons would need to be GPLed. This clearly can't happen as there are commercial, closed-source plugins.
The whole "can't use the GPL in a library if any linked product is commercial" issue (which is the same as the "can't use the GPL in a plugin if any linked product is commercial") is the very reason the LGPL was invented.