I suspect this may be the one:
But then at The Path to Portuguese Citizenship | Golden Visa Portugal La Vida, an intermediary, says:
“A recent media report suggested that some Golden Visa investors are being rejected for citizenship, for not holding sufficient ties with Portugal, but this is not the case. Having checked with several of our legal advisors we can confirm that Portugal’s nationality law does not require applicants to establish connections to the country and there is no stipulation in the legislation that allows the Portuguese authorities to dispute a Citizenship application based on a lack of connections or ties to Portugal when someone applies for Citizenship by Naturalization. Our legal partners have successfully processed several hundred Citizenship applications for Golden Visa holders and this has never been an issue or caused a rejection. In general, the main reasons one would not be approved for Citizenship is for obvious reasons such as having a criminal record, being dishonest on the application or not providing the correct documentation.”