Hi, according to the notes that accompanied the latest software update the Manhattan T3-R can receive them. I was looking for a new Freeview box so thanks for mentioning this one as I hadn't heard of it.
Software notes (Source: https://manhattan-tv.com/support/manhattan-t3#software-update):
v1.24 Software Update
Released 15/11/19
If your T3 is connected to the internet and left in standby, it will update automatically overnight, unless you have disabled automatic updates in the System Settings menu. Please see below for more information about updating, including how to update by USB.
Improved
The TV Guide has been optimised for faster navigation and presentation of programme information and icons.
Responsiveness of menus with content carousels (e.g. Featured) to very fast key presses
Persistent channel lists: After selecting a list in the TV Guide (e.g. Favourites or HD Channels), as long as the channel being viewed is on that list when you re-enter the TV Guide, the list will continue to be selected. Changing to a channel not on the list or pressing Standby will reset the list back to All Channels.
When using interactive services that use legacy MHEG-IC technology (e.g. Planet Knowledge, Sports Network, Vision TV, etc) and video is playing back you can now use all Manhattan menus (e.g. TV Guide, Home, etc).
Channel change speed when changing between HD channels with the P-UP / P-DOWN buttons.
SD video processing for more detailed video.