That person was wrong. A normal person fluent in modern English can more or less figure out Middle English, but I would defy them to figure out Old English. Here's the same Bible passage in both:
Syððan wæs geworden þæt he ferde þurh þa ceastre and þæt castel: godes rice prediciende and bodiende. and hi twelfe mid. And sume wif þe wæron gehælede of awyrgdum gastum: and untrumnessum: seo magdalenisce maria ofþære seofan deoflu uteodon: and iohanna chuzan wif herodes gerefan: and susanna and manega oðre þe him of hyra spedum þenedon.And it is don, aftirward Jesus made iourne bi cites & castelis prechende & euangelisende þe rewme of god, & twelue wiþ hym & summe wymmen þat weren helid of wicke spiritis & sicnesses, marie þat is clepid maudeleyn, of whom seuene deuelis wenten out & Jone þe wif off chusi procuratour of eroude, & susanne & manye oþere þat mynystreden to hym of her facultes
Modern English has strayed farther from that than modern French, Spanish, and Italian have strayed from Latin.