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We review some applications of the method of electronic searching forhistorical observations of sunspots and aurorae in the Chinese text corpus byHayakawa et al. etc. However, we show strong shortcomings in the digital searchtechnique as applied by them: almost all likely true sunspot and aurora recordswere presented before (e.g. Xu et al. 2000), which is not mentioned in thosepapers; the remaining records are dubious and often refer to other phenomena,neither spots nor aurorae (this also applies to Hayakawa et al. 2017c). Most ofthe above publications include very few Chinese texts and translations, andtheir tables with abbreviated keywords do not allow the reader to consideralternative interpretations (the tables also do not specify which recordsmention night-time). We have compared some of their event tables withpreviously published catalogs and found various discrepancies. There are alsointrinsic inconsistencies, misleading information (lunar phase for day-timeevents), and dating errors. We present Chinese texts and translations for someof their presumable new aurorae: only one can be considered a likely trueaurora (AD 604 Jan); some others were selected on the sole basis of the use ofthe word "light" or "rainbow". Several alleged new aurorae present observationsbeside the Sun during day-time. There are well-known comets among theirpresumable aurorae. We also discuss, (i) whether "heiqi ri pang" can stand forblack spot(s) "on one side of" or "beside" the sun, (ii) aurora color confusionin Hayakawa et al. (2015, 2016), and (iii) whether "white" and "unusualrainbows" can be aurorae.

New sunspots and aurorae in the historical Chinese text corpus? Comments on uncritical digital search applications