I get your point overall, but the highlighted bit is often used to criticize one club in particular when in reality it applies to pretty much every single one.That's one huge if.
The most successful clubs generally have the best squads. It's practically a mandatory rule that clubs in the prem have a large squad full of ready and willing replacements. Spurs do not have that in any way shape or form. As things stand, they are couple of injuries away to key personnel tfrom completely falling off the radar.
Things might has been different had last summers signings worked out but aside from Wanyama, who was excellant all season long, Sissoko, Jansen and Koudou were a complete failure, largely ineffective all season long. That's the problem with a club like Spurs, they cannot afford for their expensive signings to fail.
If we lose Kane and Alli for an extended period, we won't be as good. Clearly. But isn't the same true if United lose Lukaku and Pogba or Chelsea lose Kante and Hazard, etc., etc.? It's hardly specific to Spurs. Yes, our squad might not be as deep as others, but we'd hardly "fall of the radar".
Did Spurs fall off the radar when Kane was out for 3 months last season? Nah, they finished 2nd and Kane won the golden boot.