I'm familiar with the Bisalloy steels because I have them here right in front of me (metal fabricator by trade and laser cutter operator past 8 years).
Yep. This is a very interesting material, and of course it's a research prototype -- but it's not very strong. They list the modulus as 12.7 GPa and the yield strength (= ultimate tensile strength, since the film tears) as 488 MPa.
In comparison, polyimide (PMDA-PPD), which also easily solvent processable, has a modulus of 8.9 GPa, and a yield strength of 350 MPa.
Less equal comparisons involve polymers that are molecuarly aligned by drawing, spinning, or chemical processes. Dyneema UHMEPE has a modulus of 110 GPa and a ultimate tensile strength of 3.5 GPa. Kevlar is similar; it utilizes interlocking hydrogen bonds to convey strength. Even stronger are glass fibers (>4 GPa tensile strength) or PAN carbon fiber (> 6 GPa tensile strength).
You of course lose some strength when you make composites out of fiber -- but irregardless this polymer is many times weaker and softer.
For instance, oh, nylon fiber is stronger than some steels, and way less dense:
https://en.wikipedia.org/wiki/Ultimate_tensile_strength#Typi...
One kind of steel, "ASTM steel" comes in at 400-500 MPa; nylon fibers at 900.
Check out the Bamboo entry in the table. Human hair is also impressive.