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Hi Stefano, As long as the Ethernet cable is connected to the Pi you should have Internet access, as that side of the configuration is not changed. If you enter the command: ip addr ,you should see a line for eth0: with a ip address, something like
eth0: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b6:11:bc:3f:2e:3b brd ff:ff:ff:ff:ff:ff
inet 192.168.0.27/24 brd 192.168.0.255 scope global eth0

for me the IP address 192.168.0.27 is what my router has given to the Pi through the eth0 port. If there is no IP address then there is an issue between the pi and the router.

I'm not sure why you needed to clear your routers details from the wpa_supplicant file as the line
nohook wpa_supplicant
in the dhcpcd.conf stops the wpa_supplicant file from being read. Check that there is no entry in /etc/network/interfaces file as any entry for wpa_supplicant in this file will also start it up which will work against the hotspot setup.

If you are getting a eth0 ip address from your router but can't access the Internet then let me know and I will look into it further.