Yeah the middle of the day trains were usually accurate but the peak time service was more hit and miss - for example the "Slow Boat" train in the mornings at about 0730 off Derby (1C92) was for many years in the 2010s shown in the timetable as HST but was actually booked for a 222/5. However it was always first to be cancelled in case of stock shortages and was formed of whatever was available so often turned up as a 222/7 or occasionally a HST set if the Etches Park spare was the only thing available.
Not seen that one before but for many years the morning Kettering - Corby shuttle has been shown as a HST for a while. No different in the current and new timetable.
I see the pdf new timetable is on the EMR website, with the traction in the column headings. I suspect this is perhaps wrong then (the traction details)
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This is what I can find on RTT. There could be more services but all of these start/end at Leeds so will be a HST. Certainly on Saturdays the platforms don't really align at St Pancras so I can't find what happens next or where they come from.
Weekdays:
AM1: ECS Leeds to Sheffield then 0600 Sheffield - London, ECS to Cricklewood
AM2: 0519 Leeds - London via Derby, ECS to Cricklewood
AM3: 0634 Leeds - London via Nottingham, ECS to Cricklewood
PM1: ECS from Cricklewood, 1834 London - Leeds via Nottingham
PM2: ECS from Cricklewood, 1434 London - Nottingham, 1645 Nottingham - London, 1904 London - Leeds via Nottingham
PM3: ECS from Cricklewood, 1534 London - Nottingham, 1745 Nottingham - London, 2001 London - Leeds via Derby
Saturdays:
AM1: 0634 Leeds - London via Nottingham, Next move ???
AM2: 0740 Leeds - London via Nottingham, Next move ???
PM1: previous move ???, 1834 London - Leeds via Nottingham
PM2: previous move ???, 2002 London - Leeds via Derby
Sundays:
1: 0950 Leeds - London via Nottingham, 1455 London - Leeds via Derby
2: 1050 Leeds - London via Derby, ECS Cricklewood, 2040 London - Leeds via Derby
3: 1434 Leeds - London via Derby, 1835 London - Leeds via Derby