No. I got that text and also an email saying basically this:
"this is the first time you're in the 5%, we won't slow you down this month. If it happens again we reserve the right to throttle you" (odd because I use between 4-5 gigs every month, including last month)
"If we throttle you we will restore your speeds on your next billing cycle"
"next time we will text you if you 'approach' the top 5% and then when you hit the top 5%"
"switch to a tiered plan if you don't want to be throttled"
Also, AT&T wifi is a joke, might as well be using EDGE. Fortunately I have Optimum WiFi which is genuinely fast 90% of the time. Regardless, the heaviest data usage points are when I'm in my car or when I'm in the office. No wifi there anyway.