there is no Dock that can 'manufacture' an additional display, and it looks to my eye like that Dock will NOT support a display for your older ThunderBolt-2 Macintosh
Form the tech specs:
Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display, both at millions of colors
and
Thunderbolt[-2] digital video output
• Native Mini DisplayPort output
• DVI output using Mini DisplayPort to DVI Adapter (sold separately)
• VGA output using Mini DisplayPort to VGA Adapter (sold separately)
• Dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (sold separately)
• HDMI audio and video output using third-party Mini DisplayPort to HDMI Adapter (sold separately)
if you need help finding an adapter, just ask, and readers will be glad to provide suggestions