I don’t remember a 90s “IT bubble” - they must mean the “dot com bubble,” when people thought they would get rich overnight just by having a website. A zillion startups took advantage of it and venture capital flowed freely down the drain, just like now.
“P/E” is apparently this: https://en.wikipedia.org/wiki/Price–earnings_ratio
Very related - https://www.multpl.com/shiller-pe This is inflation adjusted. Still not great looking,
but overall not as extreme as the dot com bubble (from a strictly P/EThe original post gives 12 month forward looking P/E. You linked a 10 year moving average backward looking P/E. So the main difference is in what time period the figure looks at, not in being inflation adjusted.
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It’s all gonna crash and burn.