That is just a backwards compatible library and "there is no appreciable difference" and "this layer calls the same internal (to apc) functions that APCu does", so there's no point as you'd still be calling the same thing that Phalcon\Mvc\Model\MetaData\Apc
is calling, thus still deprecated.
But to answer your question directory, no, I don't think so.
Note: I've never used APC so I could be 100% wrong though.
would apcu_bc be compatible with Phalcon\Mvc\Model\MetaData\Apc?