Yes. This is mainly because jsPDF only supports 'normal', 'bold', etc.. With custom fonts and some tricking, we might be able to support other font styles, though. When adding a font to jsPDF, you can also specify the font-style, which in theory, could also be a numeric value. Needs to be tested though.
Also, svg2pdf needs to support numeric values. Created a new issue.
See #82: