The signaling here has evolved during the years. From pictures online I see:
In the oldest picture I can find on Chargemap, likely from 2017 or earlier, the sign said only for electric cars with a vignette, free parking without limit.
In the Chargemap pictures from April 2021, the same sign is still visible but the part "with vignette" has been blanked out".
In the Chargemap pictures from July 2021 and Google Street View images from August 2021, the sign has been replaced with a new design with just an EV logo and parking meter icon.
These pictures from July/August 2021 also show the parking spaces were repainted. In earlier pictures there was a large square crossed out with an "E" in the middle. Afterwards it was re-painted into 2 proper spots with an EV logo in the center. The new double parking spaces seem to be smaller than the original large square. It's an odd choice to have made the spaces smaller, because there's nothing to the left of the chargers except the parking meter. The spaces could have been made wider.