Armhole measurement

When a pattern states to “cont. without shaping until armhole measures 7 inches,” it means that the 7 inches is a vertical line from the initial shaping row, correct? It [I]doesn’t[I] mean along the curve, right? I’m fairly certain I’m right but need re-assurance. (If I could draw a diagram here
the dotted line is what I mean for the first part.)

Yes, in a vertical line. You’re not measuring along the curve of the armhole. It can help to follow along the row of stitches from where you began the shaping until you are out in the middle far enough to get past all the shaping and measure from there.