Unless a very recent change, that's also nonsense (that all new connections are on Standard).
BT use a mix of both, and always have.
If they all used to be Speed but are now Standard why have we always seen a mix of both?
It's not like Standard appearing on BT lines is new.
The vast majority are on the Speed profile.
I've never heard a good reason why some are on 1 or the other but it's not TV related either.
Even BT don't seem to be able to answer correctly but a line I helped setup at the start of August is definitely on the Speed profile. ECI cab, fastpath, 1800+ ES everyday. It was interleaved for the 1st 4 days.