It seems that this is falling into the classic implementation gap, like the NEC Philadelphia crash or the RI/Q crash in the 1950's. The old system was switched off, but the new system was not on yet.
Here's an updated Google translation.
Statement of the Railway Administration
The method of traffic management during the period of closures and construction works was in accordance with the Act on Railways, Decree 173/95 Coll. This is a completely standard procedure. On the other hand, after the modernization, ETCS will operate on a larger scale than before the construction, now for all train paths in the station.
In accordance with the national implementation plan, the exclusive operation under ETCS will start to apply on our busiest lines from 1 January 2025. The Railway Administration is installing the track part of the ETCS system, at the moment we have the system installed on approx. 1000 km of lines. Everything continues according to the set schedule.
For the sake of completeness, we add that according to the company owner, the train was not equipped with a safety device.
As for the investigation of the accident, it is under the responsibility of the Railway Inspection and the Police of the Czech Republic. It can be stated that, according to the Railway Inspectorate, before the accident in Pardubice, express train Ex 1021 missed a signal in a position prohibiting driving. Whether it was a technical fault, human error or a combination of both factors is the subject of a detailed investigation that may take several months.
Knowing the tragic balance of the Pardubice railway accident, we would like to emphasize that similar accidents are completely rare, and the event does not change the fact that the railway is the safest mode of transport in the long term.