That's definitely not going to work for us. Module developers rarely get things right in our experience, nor do they bother answering detailed questions (as explained in my post). They're more interested in just taking money versus providing well-coded modules. Prestashop is plagued with serious issues out of the box, and there seems to be a "module fix" for each of them (by design in our opinion). It's great way for them to take money - no thanks.
You're "almost cleared all the errors" comment is a great example of how crappy module developers are in our experience and seem to be in the business of releasing poor quality "solutions". We're just not interested in supporting this kind of shady business activity.
We tested your product page in Google's Structured Data Testing Tool (https://www.erenovation.com.au/in-wall-cistern-wall-hung-toilets/reno-302-rt-cistern-wall-hung-toilet#/59-button_option_rt-g3004109_square_chrome_12500/63-toilet_pan_color_option-gloss_white_toilet_pan) and it reports 4 warnings which I'm sure you know about.
There is a difference we've noted in the Testing Tool warnings and errors, and what Google Tools shows (increased severity). They are not giving out the same errors and warnings in all cases, some warnings are now "Errors", which are more severe.
We also suspect Google will (and has) changed its mind about how important these warnings and errors are.
This is a code problem with the core files in Prestashop in our opinion and it needs to be fixed.