I don't get that impression at all. The person you're replying to hasn't done anything more than try to clarify that whatever you want to call the cash being extracted by the French government, a reasonable person in other parts of the world could call it a tax and not miss any important defining characteristics.
With respect to claims of wanting to underpay employees, I don't think that's something anyone is actually arguing for when they talk about unfriendliness toward startups. The French government is levying a high _proportional_ tax to cover _fixed_ fees like health care. This can make sense at a societal level as a form of wealth redistribution, but it's a disadvantage for high earners like those in the software industry. Those employees can earn more in other countries with the same cost to their employers simply because less is taken out of their paycheck, and because the difference is more than enough to cover fixed fees like health care it's a good move for them to do so. The people being disadvantaged aren't startup employees (not passing a moral judgement -- the claim itself just seemed off).
