No, foreigners don't have just as much right to live in Portugal. That's what this article is about. Foreigners need an investment visa, so they have to buy the right to live in Portugal. A literal condition is that you have to buy property over €450,000 and restore it. This selects for rich foreigners so the house value increases.
If you are Portuguese you get the right to reside in Portugal for free. Everyone else (apart from EU citizens) must buy it.
I read the full article when it was posted, then skimmed it again just now. I don't agree that the article is "about" those people. It describes general issues and mentions the golden visa and D7 visa in passing as possible factors. The issues described can be caused by any inward migration of people with higher spending power. A large part of the EU has higher spending power than Portuguese locals.
If you are Portuguese you get the right to reside in Portugal for free. Everyone else (apart from EU citizens) must buy it.