That's because an 'All-Female Construction Company' is by definition not all-female if the owners and construction workers aren't all-female...
Even if the company had only females but one male on the project.
Snopes would still claim it is false because there was exactly one male on the project, thus making it not "all female"
This is why snopes is bullstuff.
No one cares about the CEO or the construction crew being males, they just want to know if the engineers were only female.