I'd say it this way: The sizes and frequency of the blunders that decide the games highlights the lack of skill.
Luck is a big part of those games, therefore, in when the blunders show and how big.
Is chess a luck game among amateurs?
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It's true amatuers can't calculate all that accurately, however the degree to which one can calculate accurately is the measure of his/her skill. Because of this if a 1700 were to play a 1500, the game would not be a 50-50% chance to win for either side, it'd probably be closer to 80-20% in the 1700's favour because of their calculation ability.
However, in some way i do believe there is SOME luck in amatuer chess because of the high fluctuation in skill, there is some chance that a higher rated opponent may simply drop a piece against me, even if it is not likely.
Amateurs cannot calculate EXACTLY ACCURATE when attacking, so does it depend on luck then???
VERY VERY OFTEN the thought of " luckily i have this piece ( to atk or defend ) " occurs then it decides who's the winner