This is assuming that the form under Lampard will be the norm this season. There’s no reason why it should be with Dyche in charge. The only data points we have to go on is the ppg under Dyche last season which extrapolated over 38 games would have had us in low/mid 40s. That’s a total highly unlikely to be relegated in any season.
Then you consider some other factors:
The PPG Dyche achieved was largely done without many home games against the bottom half (most likely opportunity for points). Lampard managed most of these games v Southampton Wolves Leicester Notthingham Forest Palace and picked up a measly amount of points. Dyche on the other hand won his only games against bottom half teams at home in Leeds Bournemouth Brentford. Add in a larger number of these opportunities over a full season and his ppg should be higher.
Attacking options: When Dyche arrived he had an injured DCL (after the Arsenal game), Gordon was sold, Maupay Simms McNeil Gray Iwobi as attacking options. This season he should have DCL (hopefully for longer) Danjuma Chermiti Maupay McNeil Iwobi and potentially even Dele. I’d rather have the second group of players than the first group.
Full season: Last season Dyche came in with confidence on the floor, injuries, little time to make big training changes etc. Now he has a fresh slate for players to start with confidence, he’s had a full preseason with them, and he has the opportunity of the Jan window.
Worse teams in the league: I find it hard to
believe that Luton Sheffield United Burnley will all be better than the three that went down last season. Southampton were a decent side with decent players and they finished bottom behind Leeds and Leicester teams that prem clubs want to take players from. I think the bottom half will be weaker this season giving us a better chance to survive.