It should be but to be 100% sure you should check the schematic/PCB layout and the datasheet for the part. It’s extremely rare for a part like a diode to have a non-standard marking pattern so this would be correct, but it’s not unheard of.

Yes. You see that triangle with a line on top of it on the PCB? The line on your diode should be on the same side as the line on that marking.

Should be, that’s the orientation I solder mine and it works.

Thanks all for your comments and answers, I’ve just tests the keyboard and it seems to work pretty fine, I’m really happy, I didn’t expect to get something working directly!

As a reminder, here is the commands I’ve used to get the firmware to copy:

# Install the required compiler
sudo apt install gcc-arm-none-eabi
# Enter in the virtual environment
. ~/.virtualenvs/qmk/bin/activate.fish
# Check the keyboard
qmk list-keyboards | grep sofle
# Check the keymaps
qmk list-keymaps -kb sofle_choc
# Compile
qmk flash -kb sofle_choc -km via -e CONVERT_TO=promicro_rp2040

AFAIK orientation does not matter as long as it is consistent across the entire board. Double check with the PCB designer/manufacturer.

Edit: Why exactly am I being downvoted? What I said is correct. Hope it helps somebody as adding one line to the firmware is trivial, especially as compared to re-soldering.