What you referred to is "US-UK Economic Prosperity Deal" which reduces some tariffs and provides market access in specific sectors but not considered a full trade deal between the two countries. Some areas of contention remains in steel and aluminium, and pharma.
So it is not considered a full trade deal and everyone remembers that it was hastily put together to provide a semblance of win for Trump, given the close relations between the two countries.
This is like a partial agreement, e.g if US and China agrees on 2 points/issues out of 10, and they put out an agreement to agree on the 2 while leaving the remaining to be negotiated.
Trump considers it a deal of course, but a deal is a deal when both countries have concluded all areas of contention. Desperate Trump even declared in G7 the deal as being a trade deal with EU, erroneously of course and corrected by UK PM Starmer.
