You can. The legacy software has these light strips accessible in Home Automation --> Light Controllers. Those 44-key LED controllers are recognized by Harmony thusly:
Brand: SUPERNIGHT
Model: SMD5050
The 28-key LED controllers can also be added without needing to be learned:
Brand: APA
Model: APA 1616
By the way, the 44-key controlled kit you found is
a bit cheaper here.