I'm Snow Leopard but get the same "Warning: SUID file...." and ACL found but...." cautions. In fact, I've been getting them for so long now that I just use them as a handy way to know I'm near the end of the permissions repair process.
iMac (Retina 5K, 27", 2017), 3.4 GHz Intel Core i5, 8GB RAM, 2400 MHz DDR4
OS Mojave 10.14.6
Canon MX710 Printer
Epson Perfection V500 Photo Scanner
Time Machine on 1TB LaCie USB-C
Carbon Copy Clone on 500GB OWC Mercury OTG Pro