is always the same. I did exactly as you say. In fact, if you zoom in on the words that at first glance appear gray, these are actually black. But I do not understand why acrobat reader dc gives me this problem.
Maybe in the end it's just a font problem.
try to change it using a windows classic or when you export from solidworks changes how characters are handled (only trutype or in autocad mode) in dwg/dxf options
that is a problem of reading by acrobat, which probably does not correctly read the vatelapesca.shx font (usually the extension of the font used for exporting from solid).
if in export options put trutype characters, then using native windows fonts, I think the problem is solved