The Flinders-led Nature Communications study (preclinical mouse model, n=~120 across cohorts, no human data) demonstrates that physiological tau phosphorylation at T205 is required for selective engram cell recruitment during remote memory consolidation, preventing noisy over-recruitment. This mechanistic insight reframes tau beyond its pathological aggregates, showing controlled modification organizes sparse memory traces while disease-associated tau isoforms scramble both encoding and cue-based retrieval. Mainstream coverage missed the timing-dependent divergence: early tauopathy blocks new engram allocation, later pathology impairs access to intact traces via aberrant excitability. Cross-referencing with Roy et al. (Nature 2016) on engram silencing and a 2022 Acta Neuropathologica observational series on human tau seeding (n=42 postmortem cases, correlative design with selection bias risks), the work highlights why anti-tau therapies may need stage-specific targeting to spare physiological functions. No industry conflicts declared; funding was Australian NHMRC grants.