-snip-
Yes squads depth is definitely the key to win the league. Without squad depth definitely run is gonna be a short one as the team can get into trouble if you are hit by injuries. Spurs do lack in some areas but the good thing is that their injured players will be back in January so not a big worry. Long term injuries would have affected them drastically though. The only thing they need to do is do their best until their players gets recovered.
Maintaining consistent performance amidst player injuries is very difficult. Some reserve players cannot always be relied on every match because their performance is unstable, so player injuries will always be considered detrimental. A decline in performance is possible due to a storm of injuries, this also happened to Manchester United and Manchester City in several matches.
Tottenham is a team that could possibly compete fiercely for the Premier League title this season. I don't expect Manchester United to do the same if Ten Hag doesn't find his team's best form, but Arsenal and Liverpool will both struggle to break Manchester City's dominance. Manchester City is still the best, but the competition will be very tight this season.