Nope this is very true. I do QWISO washes with all my trim, and small buds. If you freeze the alcohol and material for at least 24 hours first, and keep it all cold you won't pull hardly any chlorophyl on the first wash. You wash for 30-40 seconds and pour out the alcohol through a filter. Then do your next wash with fresh cold alcohol before your material starts to warm up.
Just last week I made a batch that was a beautiful light amber shatter. The first is AAA the second wash is a very dabbable B grade, and the C grade is best for edibles since by that point the material has been soaking in alcohol for multiple minutes which has pulled a fair bit of chlorophyl. Each successive wash you will get more. Because of that I usually only do 3 washes.