Lidl will be doing what the independent bottlers do.
Storing and aging Malts for 10, 15, 25... etc is an expensive business with enormous amounts of working capital sat there producing no cash flow. Plus, being a natural product there can be great variation between barrels - some not compatible with the Distillery's flavour profiles or, for some premium producers, not up to standard.
So, distilleries sell off individual, general at the younger end, barrels to the Independents. Some of which will be bottled with the name of the Distillery but not the branding and will most likely be distinctively different from the Branded version. Some will be bottled under invented names with no distillery identifier, maybe because the Distillery wants to protect its branded product. For the Distillery this is all win-win as they get cashflow early and keep their product consistent.
Equally, it is win-win for Lidl and fits their business model perfectly. Ship the barrels direct from the Distillery to an independent bottler who bottles that batch under the Lidl brand and straight into the Lidl supply chain - no storing/aging costs, cheap bottling price using underused capacity at the Independent, rapid distribution.
Win-win for the punter too - properly produced Malt Whisky, often from big name Distillers but at low price.