The verses refer to Shafaa’ah on the Day of Judgment.
As for Waseelah, I don’t think using intermediaries to Allah is right.
Allah should be approached directly, we can use our prayers, worship, righteous deeds and the Holy Names of Allah as a Waseelah but using the Prophets (pbut), the Martyrs or the Saints as an intermediary is to me Christianity or Arab-Paganism under the guise of Islam, the Arab-Pagans also considered Allah the Supreme Lord and Creator and maintained their idols of pious men were merely their intercessors with Him.
“They worship besides Allah things that hurt them not, nor profit them, and they say: “These are only our intercessors with Allah.”
(Intrepretation of the meaning of the Noble Quran 10:18)