They are wrong
You can use equipment to buff him and get value, and you can use cards like Angelic Exaltation and Sublime Archangel to set up for big swings
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If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it
nothing else doubles up equipment triggers without some additional qualifier (it has an enters ability for Panharmonicon, a saboteur ability for Felix Five-Boots, etc.)
For Nomura, we were also shown a double-sided card, this time featuring Sephiroth, in a way that looks like it would be right at home on a wall scroll