that is not an answer...you have just repeated the same position you have already made.
A logical reading of even the Hebrew says you are wrong in either way you are interpreting it. Either Genesis 7:19 means:
1. none of the hills under the heaven were higher than 15 cubts (according to Westminster Hebrew) or,
2. the waters covered the highest hills under the heavens by 15 cubits (according to Berean study bible translation for example...and many others)
For YEC and the traditional belief (ie literal reading of Genesis) to be a valid conclusion,
THE ONLY support that YEC requires to prove its position, is that all life on the earth was killed by the flood because the highest hills/mountains were lower than the flood height. Whether 15 cubts in total or above the highest hill makes little difference to YEC view.
BTW the latin vulgate uses the above interpretation so there is even among very early translations debate about the exact writings, however, it seems to me that they all are unanimous in the claim that all the mountains were covered in the whole earth during the flood. A localised flood is not a supported interpretation from any of the writings we have discussed here.
20 | quindecim cubitis altior fuit aqua super montes quos operuerat
The water was fifteen cubits higher than the mountains which it covered. |