Even then not necessarily sufficient. Source: worked with a trainer on this for months after pulling my back at a crossfit years earlier and still having lingering effects. Sitting a ton creates, or can create, large hip inflexibility, tight hamstrings, etc. If budget and space isn't a material constraint, get a hexbar... it will lessen some of the impact on your back.
Deadlifting (and squatting) is arguably the most important full body exercise you can do, and the staple of every single marvel super hero body transformation, but the risk threshold is fairly high for a beginner.
If you want to stretch, try ROMWOD. A bit intense but likely the most impactful in terms of results.
