Well, that may be true of some folks -- but Veebyes is a very reliable and credible poster. I happen to disagree with his viewpoint on this issue -- speaking from painful experience, when I was a newbie, I did disconnect a fully charged battery, let it sit for almost four months, came back, it was flat, and it would no longer hold a charge. Sixteen years later, my BatteryMinder Plus is still going strong, and my flooded batteries tend to last about five years before they need replacement.
But just because I disagree with him on one point does not mean that his opinion is without value. He is very experienced and knowledgeable, judging by his many posts over a very long period of time.