Teams are required by rule to spend 89% of the cap over a 4 year period. Dallas certainly meets this. The cash may differ in the short run, but not in the long run. I do not believe Dallas is skimping to save 11% (100% - 89%). That makes no sense.
Dallas is facing a potential mountain of dead money- and there's no manipulating that. That's a dollar for dollar reduction in the available cap. This is why you see the inaction by management right now, in combination with the large contract demands of its stars.
We don't have to "think" or "guess" or "believe".
We can look at the actual data. Blogging the Boys put some of the data together, looking at various time periods over the last decade.
The NFLPA released data from 2013-2016. The Cowboys were 25th in cash spent over that four year period (and that includes big FA signings like Carr as well as Romo's big extension).
Jason La Canfora released an analysis of team salaries showing the period from 2016-2019. Dallas was DEAD LAST in cash spent over that period.
There was no 2020 data available but the NFLPA released a study of the period from 2021-2023. The Cowboys were 30th in cash spent.
These are just facts. The Cowboys, over the last decade, have literally been one of the "cheapest" teams, for lack of a better term, when it comes to investing in the roster.