Those who claim it either have malicious intentions or demonstrate utter ignorance of the Ancient world.
Women were pretty much segregated
in most of the pre-Christian societies. In Athene, for instance, women
from good families weren't expected to leave their homes unless
accompanied by a male relative. Poor women leaving their homes by
necessity was seen as a problem. Yet, it doesn't mean they were
unimportant. It means that they had their own female sphere of influence
as described here:
Women were responsible for ensuring
that food was prepared, supplies were maintained, and that servants or
slaves efficiently carried out their tasks.
In wealthier households, although
slaves performed much of the manual labor, the mistress of the house
still managed and supervised their work.
As a result, the smooth functioning of the home depended on the woman’s ability to manage resources and labor effectively.
Weaving also held a central place in
the daily routine of Athenian women, who were expected to produce
clothing and textiles for their household.
Women spent long hours at the loom,
weaving garments for their family members, a practice seen as a
reflection of their diligence and moral virtue.
Additionally, the production of cloth had economic value, as surplus textiles could be sold or used in trade.
As a result, weaving became one of
the few ways in which women directly contributed to the economic
stability of their families.
However, despite their confinement to
the private sphere, Athenian women influenced public life indirectly
through their roles in managing the household and raising
future citizens.
By raising sons who would later serve
in the Assembly and perform military duties, women contributed to the
political future of the city.
That is exactly what the Proverbs 31 passage describes. And btw, speaking about "selling". Most of the trade at this period was natural exchange, money was hardly used. Textiles would often be exchanged for luxury goods.
And now about that field (no, the lady wasn't a real estate agent):
In wealthier families, wives often had
additional responsibilities, including overseeing agricultural
production and handling the household’s finances.
I doubt those who tell women to get a job outside home because "Proverbs 31 lady did" would really enjoy living in that type of society (as opposed to a feminist caricature of it):
Public spaces, particularly those connected to politics and intellectual life, were reserved for men.
As a result, women rarely appeared in
public, except during religious festivals or funerary rites, which
allowed them to step briefly outside their prescribed
private roles.
By managing your household well and taking wise financial decisions (a penny saved is a penny earned) you are following in the footsteps of the Proverbs 31 lady much better than by mixing with strange men in the modern workplace or even working from home for a different boss than your own husband.