Testing anti-ddos iptables rules on loopback address

Question

I am setting up anti-ddos iptables rules on a kali linux vm for a class. I have tried two methods, one being just the iptables -A INPUT -p tcp --syn -m limit --limit 1/s --limit-burst 3 -j RETURN rule and the other using the bash file from here https://github.com/xenvn/iptables-ddos-protect/blob/main/rules.sh. Both times I used a python script to test that looked like this:

target_ip = "127.0.0.1"
target_port = 80

syn_packet = IP(dst=target_ip) / TCP(dport=target_port, flags="S")

send(syn_packet, count=10000, inter=0.0001)

After setting up the rules and then running the script, I used the sudo iptables -L -v -n command to see what rules got hits. In each case, the rules came back with 0 results, so I am not sure if its the rules aren't working or if testing using the loopback address doesn't work. What am I doing wrong?

EDIT: I added another rule to enable logging and made the file in /var/log. Using the sudo tail -f /var/log/iptables.log command is making the following output:

┌──(kali㉿kali)-[~]
└─$ sudo tail -f /var/log/iptables.log
May  5 17:43:09 kali kernel: [   77.295500] Monitor 0 (w,h)=(1920,944) (x,y)=(0,0)
May  5 17:43:09 kali kernel: [   77.295862] Sending monitor positions (8 of them)  to the host: VINF_SUCCESS
May  5 17:43:09 kali kernel: [   77.295918] RRScreenChangeNotify event received
May  5 17:43:09 kali kernel: [   77.296002] Monitor 0 (w,h)=(1920,944) (x,y)=(0,0)
May  5 17:43:09 kali kernel: [   77.296082] Sending monitor positions (8 of them)  to the host: VINF_SUCCESS
May  5 17:43:09 kali kernel: [   77.296132] RRScreenChangeNotify event received
May  5 17:43:09 kali kernel: [   77.296754] Monitor 0 (w,h)=(1920,944) (x,y)=(0,0)
May  5 17:43:09 kali kernel: [   77.297478] Sending monitor positions (8 of them)  to the host: VINF_SUCCESS
May  5 17:45:49 kali kernel: [  237.350100] device lo entered promiscuous mode
May  5 17:45:50 kali kernel: [  238.332596] device lo left promiscuous mode
^C