The team obviously hadn't had time to get Reaves into a Rangers jersey for the photo and decided to use a template from a former player. That player, as pointed out by a sharp-eyed Twitter user, is Tony DeAngelo.
It's clearly the template they used for the Reaves announcement. Whether this was an intentional dig at DeAngelo, who did not leave the Rangers on good terms, or a complete coincidence will likely never be known.