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That's talking about something fundamentally different. An LCD screen is transparent, so it can be lit from the back or from the side. With an eInk screen, it's opaque, so the lighting has to be from the front. Even when the lighting LEDs are at the sides of the display bezel (as they are for all illuminated eInk devices), they are still in front of the eInk panel, so to refer to them as a "backlight" is fundamentally wrong. It's their location with respect to the display panel that's important. The lighting LEDs found in eInk devices are in front of the display panel, hence they are front-lit.
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