That's a charitable reading but it doesn't track with what they actually said. The first paragraph says that all modern Linux binaries are compiled with PIE, so Alpine has no advantage there. The second paragraph says that glibc is more secure than musl heap-wise. The third paragraph is the conclusion, which is that Alpine is less secure because it uses musl.
A sentence thrown on to the end of the conclusion should normally be read as reemphasizing the reasons for the conclusion unless it starts with a word like "though" or "however".
A sentence thrown on to the end of the conclusion should normally be read as reemphasizing the reasons for the conclusion unless it starts with a word like "though" or "however".