No it isnt....just a fyi that ppm numbers can mean different things to different meters. Sounds to me like yours reads at a different conversion than Rhiz.

Usually when plants burn they droop and get somewhat curly looking get very soft feeling and then dry up, and turn brown. Hopefully you will see that plant going back the other way now so keep an close eye on them.

PS...if you don't see them start to improve I would consider dropping your ppm number back even more.