Sure, but opening the image in a browser wont run any malware even if there's one concealed inside the image data that can be extracted by specific "innocent-looking" software.

The only possibility of doing something that bad (i.e. running the malware by just opening the image) would be a malformed image that manages to do a buffer overflow in the image parser of the browser (see this recent example: https://chromereleases.googleblog.com/2023/09/stable-channel...)... but I rather think that this specific case is just a false positive.

EDIT: someone in the thread apparently rescanned the file (I didn't check if the file was the same or was modified in-between on the original site) and it indeed appears clean now.