Pants come in waist sizes and leg lengths. You have to get them both right or they won't fit.

Bicycles come in seat tube and top tube lengths. Not only do you have to get them both right but all the bike manufacturers don't even measure them the same.

Bike riders come in different porportions of torso's vs. leg lengths. Consequently, two riders who are exactly the same height might have different bike sizing needs.

I wouldn't put too much reliance on advice given by someone who has never seen me and whose background and experience are unknown to me.