Salaams. There appears to be a typo here (underlined):
"Therefore, it seems that is was not an angel that visited Mary in the incident covering the Quranic narratives in verses 19:17ff, but a 'Spirit'. If the Biblical perspective is accepted whereby Gabriel visited Mary to give glad tiding of a son, then the Spirit mentioned in the Quranic narrative would imply it to be Gabriel. Such a synonymy of Gabriel and the Holy / Faithful Spirit has already been noted in the Quranic verses cited above (2:97, 16:102 and 26:192-195).
However, in verses 19:17ff, it appears that the Quran deliberately avoids using the term 'angel' in the comparable narratives concerning Mary when it could have done so as in verse 3:45. This is 'possibly' with a view to depart from the Christian understanding that Gabriel was in fact an angel."
As always, thank you for the insightful articles.