Absolutely, think "lick" vs "leak". I think the author means Hungarian maybe uses very similar looking letters to denote this (ie "lik" and "lík").
In Hungarian also every vowel comes in pairs of short-long: a-á (what vs high),
e-é (ever vs eight), "o-ó" (moss vs most), "u-ú" (put vs you), "ö-ő" (fur vs ... well long version has no English equivalent I think but German does: schön).
In Hungarian also every vowel comes in pairs of short-long: a-á (what vs high), e-é (ever vs eight), "o-ó" (moss vs most), "u-ú" (put vs you), "ö-ő" (fur vs ... well long version has no English equivalent I think but German does: schön).